Search: friction

Number of results: 6,581

Physics (simple stuff)
. Does the force of friction depend on the area of the sliding surface? What is larger, static friction or sliding friction when an object is stationary? Why sand is placed on icy streets and sidewalks? )something to do with friction) how could you reduce sliding friction
Tuesday, March 31, 2009 at 12:06am by drago

physics
I'm assuming you're referring to kinetic friction here, in either case (static or kinetic friction) however the following method is able to find the answer. Friction=mass*g*friction constant In this case the force of friction is equal and opposite to 20N, so Friction...
Wednesday, October 26, 2011 at 2:43pm by Peter

Science...Please help
What is friction? Can you give me some examples? -THANK YOU FOR ALL YOUR HELP! friction: Ever have a pinwheel and move it thru the wind? Friction makes the wheel turn. Ever on a bike an press the brake? Friction makes the wheel stop. Friction is the force where it stops things...
Monday, April 16, 2007 at 5:54pm by Hillary

College physics
weight-friction=mass*a 40g-friction= 40 a solve for friction.
Thursday, February 4, 2010 at 5:05pm by bobpursley

physics- MC QUESTIONS
1. You push a block up a ramp with friction. The block is moving at constant speed ? A) The force you push with is greater than the force of kinetic friction. B) The force you push with is less than the force of kinetic friction. C) The force you push with is equal to the ...
Thursday, May 3, 2012 at 11:57pm by emiie

Physics
When friction is used to counteract centrifugal force, the side friction factor, f, between the tires and roadway is incorporated into the calculation for the superelevation angle. (the angle of road banking where friction is not needed) tan@=[(Vt)^2-(f)(r)g]/[(r)g+f(Vt)^2] (...
Tuesday, March 29, 2011 at 9:00pm by Matthew

physics help!!!
The minimum work required in the potential energy increase at the top of the ramp. you need the height of the ramp for that. That would be 460 sin 17.5 With friction, you need to add the work done against friction, which is (friction force) x 460 m. Use the coefficient of ...
Tuesday, November 17, 2009 at 10:00pm by drwls

physics
There are a couple of ways to do this. Netforce= ma 200N+friction=ma -200N + ma=friction solve for friction force. Work done on by friction=forcefricion(10m) Now notice
Tuesday, February 3, 2009 at 6:51pm by bobpursley

Physics (Mechanics)
A 10-kg crate on a ramp is inclined at 30 degrees from the horizontal and released. The coefficients of friction between them are .48 (coefficient of static friction) and .28 (coefficient of kinetic friction). a) Does the block slide? b) What then is the actual friction force...
Sunday, September 30, 2012 at 5:36pm by Anonymous

Physics
(a) Friction force * distance = (initial kinetic energy) Solve for the friction force. (b) Divide friction force by puck weight to get the coefficient of (kinetic) friction.
Monday, October 24, 2011 at 12:07am by drwls

Physics
Equate the work done against friction to the loss of kinetic energy. This will let you solve for the friction force. Divide that by the weight of the car to get the cefficient of sliding friction.
Wednesday, September 19, 2007 at 5:42pm by drwls

science
Examples of positive, negative and neutral friction? We always learned about friction as either being positive (tires gripping the road, brake friction for stopping etc.) or negative friction (causing wear or heat as in a bearing or engine due to parts moving against each ...
Sunday, March 16, 2008 at 9:36am by sw

Physics
What are m1 and m2? Rolling friction has very little to do with the coefficient of friction between tires and the road. It is determined by tire air pressure and bearing and engine friction.
Tuesday, March 19, 2013 at 7:25pm by drwls

science
rolling friction- riding your bike or skateboard sliding friction-cartlige against your bone static friction- you trying to push a heavy bookcase fluid friction- when you ride your bike through the air (this is when an object moves through anything flowing. yes, air counts)
Tuesday, October 20, 2009 at 8:38pm by beth

Physics
a) What is the total force of friction on a wagon’s wheels if it takes 30 N to move it at a constant speed across a bumpy path? b) Where on a bicycle do you want to reduce friction? How is this done? c What is meant by the coefficient of kinetic friction?
Saturday, September 29, 2012 at 7:19pm by Hanu

physics
If there is no friction, the KE at the bottom is the same as the PE at the top. But friction is present. I think I would measure how far the ball traveled. You know the initial PE, so that energy must have went into friction. Friction is goverened by.. Frictionforce*distance=...
Thursday, March 27, 2008 at 4:02am by bobpursley

physics
The force of friction on the slide is mg*mu*cosTheta, and the component of gravity down the slide is mgsinTheta F=ma=m(vf/time) but vf with friction is 1/2 that of no friction (why? average velocity is 1/2 that of no friction). so, with friction... mgSinTheta-mg*mu*Costheta=m ...
Monday, December 15, 2008 at 5:03pm by bobpursley

physics
The horizontal component of the tension in the rope, T cos 19.3, will equal the friction force, since the sledge is not accelerating. Compute the friction force using the kinetic friction coefficient, making sure that you take into account the vertical component of the rope ...
Sunday, March 20, 2011 at 10:36pm by drwls

Physics
A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2. 1. Find the friction force impeding its notion? 2. What is the coefficient of kinetic friction? *Are we dealing with Kinetic or Static Friction...this will effect coefficient ...
Wednesday, June 13, 2012 at 10:51am by Mike

Physics
yes on 1) 2) YOu have to find friction first. applied force - friction = m*a so you know applied force 4N, m=2kg, and you are given a=1.2 so you can find friction. Now friction force depends on mass, so if you increase F to 5N use the same equation to find acceleration, youj ...
Tuesday, April 5, 2011 at 10:40pm by bobpursley

physics
Why is it impossible for a skier to reach maximum speed that is physically possible by converting the change in height to speed? what is this question asking? Some of the potential energy available is lost due to friction. Friction on the skis, friction on the air.
Thursday, May 31, 2007 at 10:09pm by Sam

Physics
<<Are you saying that whether or not there is acceleration, the friction force would always equal to that of the pulling force?>> No. That is not what we are saying. The imbalance between the pulling force and the friction force provides the ...
Friday, May 15, 2009 at 12:02pm by drwls

college physics
Work done by broom = Kinetic energy increase + work done against fraction Compute the friction work using that equation. Divide it by the distance moved to get the friction force. Use that to get the friction coefficient
Thursday, February 18, 2010 at 9:26pm by drwls

Science
How is friction involved in Volleyball? Hand touches volleyball maybe.... i know that but what type would that be?? Spinning friction orrolling friction??? The type of friction would relate to exactly how the hand comes in contact with the ball. Since "rolling" ...
Monday, March 26, 2007 at 8:55pm by Aaron

physics
Neglecting friction? I have never understood why competent teachers give problems such as this I assume your teacher imagines there is no friction, but the current gives a force? What exactly is friction? anyway, add the force vectors, get the resultant, then compute a=Force/...
Sunday, November 25, 2012 at 2:27pm by bobpursley

Physics
Why is the coefficient of kinetic friction generally less than the coefficient of static friction? Fk<Fs http://en.wikipedia.org/wiki/Friction
Monday, June 4, 2007 at 3:41pm by Steve

college physics
(initial kinetic energy) = (work done against friction) (1/2) M V^2 = F * d F is the friction force, which in this case is 0.25 M g. The 0.25 factor is the coefficient of kinetic friction. Solve for the distance d. M cancels out. d = (1/2) V^2/(0.25 g) = 2 V^2/g
Thursday, February 25, 2010 at 8:52am by drwls

Physics
work= weight*height= m*g* 460SinTheta. Now with friction, add to the basic work in a), the work done on friction, which is normal component of weight*coefficent*distance or friction= mg*CosTheta*mu*460
Thursday, October 15, 2009 at 1:32pm by bobpursley

physics
What is 0.8? The coefficient of friction? Static or kinetic? If they are at rest on a horizontal plane, and the cord is unstretched, friction is zero. In some situations (incline or stretched cord) there can be static friction sufficient to maintain equilibrium. You have not ...
Sunday, January 9, 2011 at 9:42pm by drwls

PHYSICS
Ff is force friction. Fn is the normal force, not the mass of the object. The normal force does depend on the weight of an object, which ultimately depends on the mass. Although there is no difference in the actual equations for physics, there is a difference between kinetic ...
Thursday, April 16, 2009 at 11:26pm by Carlie

Physics
A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the box on the plank and gradually raises one end of the plank. When the angle of inclination with the horizontal reaches 30°, the box starts to slip...
Thursday, October 1, 2009 at 11:32am by Mario

PHYSICS
A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the box on the plank and gradually raises one end of the plank. When the angle of inclination with the horizontal reaches 30°, the box starts to slip...
Saturday, December 13, 2008 at 10:16pm by john

physics
PE gained= mg(sin24.3)d friction work= unknown Initial KE-finalPE=workdoneby friction+finalKE 1/2 m*7.04^2-m*g*1.78*sin24.3-1/2 m 3.04^2= work done be friction 1/2 *69.4*(7.04^2-3.04^2)-mg*1.78*sin24.3=workdone by friction.
Wednesday, November 30, 2011 at 8:26pm by bobpursley

physics
The friction force is M*g*Uk IF the desk is moving. Uk is the kinetic friction coefficent in this case. The problem should have told you if the desk is moving, and whether the coefficient of friction is static or kinetic. If the desk is not moving, the applied force equals the...
Thursday, December 1, 2011 at 9:46am by drwls

physics
Use conservation of energy to calculate the velocity at the ground with no friction. V = sqrt (2 g H) = 15.97 m/s If there is a lower velocity of 8.0 m/s, which is about 1/2 of the frictionless value, than about 3/4 of the available potential energy has been lost to friction. ...
Thursday, November 12, 2009 at 8:12pm by drwls

AP Physics
A child on a sled starts from rest at the top of a hill and slides down. Does the velocity at the bottom depend on the angle of the hill if: (a) it is icy and there is no friction? (b) there is friction (deep snow)? I'm thinking that the angle will always be a factor, ...
Thursday, October 15, 2009 at 2:55am by Henry

physics
A hockey puck of mass 0.27 kg is sliding along a slippery frozen lake, with an initial speed of 56 m/s. The coefficient of friction between the ice and the puck is μK = 0.032. Friction eventually causes the puck to slide to a stop. Find the work done by friction.
Thursday, March 19, 2009 at 3:45am by cbrown

science
Words to use: Accelerate - Sliding - Brake - Friction - Slipping - Inertia Velocity - Wheel - Strength - Static - Terminal velocity Questions 1. An object will ____?____ when the net force is not zero. 2. ____?____ will never speed up an object. 3. The friction that prevents ...
Tuesday, November 9, 2010 at 8:01pm by Jacob

Physics
a) (1/2) M [V2^2 - V1^2] b) Negative work is done slowing it down. Same result as (a), if there was no friction. If there was friction, you have to know how far it moved to compute the work done. c) Assuming no friction, Work done = (force)*(distance) = kinetic energy change ...
Friday, November 16, 2007 at 5:26pm by drwls

Physics HELP!
If the angle is 25 degree below the horizontal, then the upward component makes the friction lighter (less normal force). friction=mu(normal force) = .3(mg-20sin25) =.3(30-8.45) = no answer. so assuming the 25 is above the horizontal, friction will be greater.. friction= = .3(...
Friday, May 25, 2012 at 5:39pm by bobpursley

Physics
Since the kinetic energy does not change, Friction work = (Friction force)*(sliding distance) = Potential energy loss M g*3.0 m = Ff*7.0 m Ff = (3/7) M g = 105 J is the friction force that resists motion.
Tuesday, November 22, 2011 at 11:51pm by drwls

physics
The work done by the spring is the elastic potential energy, which is (kx^2)/2. The energy dissipated by the friction is the work done by the friction force (the friction force x the distance). These two things added together (the work of the spring and the energy of the ...
Thursday, February 28, 2008 at 9:58pm by DanH

PHYSICS URGENT! PLEASE FRICTION CASE 2
A 13 kg box is at rest on a level floor. The coefficient of static friction µS = 0.9 and the coefficient of kinetic friction µK = 0.8. Audrey is applying a 140 N push at an angle (=20°) as shown in Figure 1. C) What is the magnitude of FNormal on box from Earth?
Tuesday, December 4, 2012 at 7:14pm by Sophia

Physics
(friction force) x (distance of skid) = Kinetic energy loss Use that equation to get the friction force, f. The coefficient of kinetic friction, Uk, can be obtained from Uk = f/(M*g)
Friday, April 17, 2009 at 12:39am by drwls

physics
Net force= m*a 75-friction=m*.55 85-friction=m*.78 subtract the first equation from the second 10=m(.23) m= 10/.23 then solve for friction in either equation, finally, mu=frictionforce/mg
Saturday, February 13, 2010 at 7:23am by bobpursley

physics
InitialPE-friction=final KE solve for friction work. Now, friction work= mu*mg*cosTheta*11meters solve for mu.
Saturday, April 21, 2012 at 12:54pm by bobpursley

Physics
A 13.0 -kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2 What is the coefficient of kinetic friction? * If I know the friction force impeding the object motion is 67 N. How do I find the coefficient of kinetic friction?
Sunday, June 17, 2012 at 11:16am by Mike Joseph

physcs
I w /8.0 s = angular momentum decrease rate = torque = friction force* radius w is the initial angular velocity = 55*2*pi/60 = 5.76 rad/s I is the moment of inertia Solve for the friction force and use that and the applied normal force to get the coefficient of kinetic friction.
Saturday, April 17, 2010 at 9:40pm by drwls

physics
The work done by friction is -(1/2) M V^2, no matter what the coefficient of firction is. With a + sign, it is the work that the puck does against friction, which equals the initial kinetic energy. If you compute the friction force and multiply it by the distance the puck ...
Thursday, March 19, 2009 at 3:45am by drwls

Physics
4) A 1200 kg car is accelerating at 1.6 m/s2. If the coefficient of friction of friction is 0.15, what is the force applied to the car by the engine? here do you use the equation kinetic friction= μk(normal force) and put in 1.6 m/s^2=.15(Fn) is this how you go about it?
Saturday, October 31, 2009 at 3:31pm by Anonymous

Physics
I have learnt that when we push an object on a horizontal plane with a certain angle, we are increasing its normal reaction and therefore friction increases. Whereas if we pull it, friction decreases. Is that true? Yes, there is more friction if you push down, at an angle, ...
Tuesday, June 5, 2007 at 11:15pm by Ishani

physics
KE2 - KE1= A(friction). KE2 - KE1=0-(m•v^2)/2= - (m•v^2)/2. A(friction) = F(friction)•s•cosα = k•m•g•s•(-1) = - k•m•g•s. (m•v^2)/2= k•m•g•s. v=sqroot (2•k•g•s)= =sqroot (2•0...
Monday, February 27, 2012 at 2:58pm by Elena

Physics Help, Please!
When a car goes around a curve (without skidding), on a level road, Select one: a. no friction force is needed because the car simply follows the road. b. the friction force of the road on the car increases when the car’s speed decreases. c. the friction force of the road...
Sunday, November 4, 2012 at 1:48pm by Michael

Physics
In each case, there are two vertical forces: the weight and the applied force P. Multiply the sum of them by 0.4 (the static friction coefficient) to get the maximum force required to overcome friction. If this force is not exceeded by F, the block will not move. In that case...
Saturday, October 8, 2011 at 3:21am by drwls

Physics-Mechaincs
assuming the force is at some angle downward. Figure the horizontal, and vertical (downward components) The horizontal force is the pushing force, opposing friction and inertial. The friction is mu*mg on each block, but on whichever block that there is a downward component of ...
Friday, September 24, 2010 at 4:58pm by bobpursley

physics
The work done by gravity is M g * (decrease in elevation) = M g 2.00 sin 53 The work done by friction is -(friction foirce)(distance moved) -M g cos 53 (0.4)* 2.00 It is negative because work is done against friction
Thursday, March 6, 2008 at 9:56pm by drwls

Physics
If you try to push an object that is 10 times heavier than you would there be static or kinetic friction? ( the heavy object doesn't move if even you use force) -I know that there is no kinetic friction because the object is not moving. I am not sure about static friction.
Friday, June 24, 2011 at 5:20pm by Susan

physics
a 5-kg crate is resting on a horizontal plank. the coefficient of static friction is .5 and the coefficient of kinetic friction is .4. after one end of the plank is raised so the plank makes an angle of 25 degrees with the horizontal, the force of friction is?
Tuesday, October 26, 2010 at 11:29am by colin

College (?) Physics
(1) 600 N is also the friction force, since it balance the pushing force for zero accleration. The coefficient of friction is the ratio of friction force to weight. (2) This is the same kind of problem as the previous one. They need to tell you the mass or weight of the wood ...
Wednesday, October 13, 2010 at 10:36pm by drwls

Physics
Thank you so so much. Well I got the first two answers correct now. But in c i think i should use friction force which should be rubber upon concrete? Co-efficient of kinetic friction for that is 0.8. (I need the kinetic friction co-efficient here right?) But i'm not sure ...
Tuesday, March 9, 2010 at 5:32pm by Kay

physics
A 5-kg crate is resting on a horizontal plank. The coeï¬ƒ- cient of static friction is 0.5 and the coeï¬ƒcient of kinetic friction is 0.4. After one end of the plank is raised so the plank makes an angle of 25 with the horizontal, the force of ...
Sunday, January 20, 2013 at 8:42am by ashlee

physics
IP You want to nail a 2.4kg- board onto the wall of a barn. To position the board before nailing, you push it against the wall with a horizontal force to keep it from sliding to the ground What happens to the force of static friction if you push against the wall with a force ...
Thursday, November 11, 2010 at 6:39pm by mathhelp

Physics
The equation of motion for a solid sphere rolling uphill is M*g sinbeta-(2/5)M*a = M*a The second term on the right is the friction force, assuming no slipping. Rearranging gives you a = g*sinbeta/1.4 To prevent slipping, the friction force (2/5)M*a = (2/5)M*g*sinbeta*(5/7...
Tuesday, April 3, 2012 at 6:34pm by drwls

physics
k = F/(deflection) = M*g/(0.30 m) = ___ N/m P = 2 pi sqrt(M/k) = ____ seconds Changing from vertical to horizontal vibration does not change the period in a frictionless situation. There might however be more friction when vibrating horizontally, and this makes the period ...
Friday, March 25, 2011 at 12:32am by drwls

science
How fast a car decelerates depends upon how strong a force is applied to the brakes, unless the tires skid. If that happens, the friction force is proportional to the weight, so the deceleration rate is (Friction force/mass) which is independent of weight. This assumes the ...
Saturday, May 17, 2008 at 2:19am by drwls

physics
How can I find kinetic friction (Fk) without mu? I know the normal force which is 201N. The mass of the object is 30kg. This is the full questions of it helps. I just don't understand how to find kinetic friction 1. If a 30kg object experiences a normal force of 210N when ...
Wednesday, June 22, 2011 at 8:32pm by Tina

Physics
1.a (static friction is pushing up on the box to keep it from sliding down the incline) 2.b (static friction is pushing down on the box to keep him from moving it up the incline) ^^friction always pushes the opposite direction of the force acting on the object^^ 3.Fphysisist &...
Monday, September 22, 2008 at 4:34pm by Kyle

physics
first find friction; friction= mu*fnormal= mu(mg+245sinTheta) then find the horizontal component of force fhorz= 245*cosTheta net force= horizontal-friction
Sunday, December 5, 2010 at 1:28pm by bobpursley

physics
whtas mu? the cof of friction? or mass or the coef of friction?
Sunday, October 31, 2010 at 8:50pm by anthony

physics
1) consider air friction, and then no friction. 2) What causes weight? What is gravity?
Tuesday, March 10, 2009 at 11:06am by bobpursley

science
a) friction. Without gravity, there would be no friction forces.
Sunday, April 17, 2011 at 1:03pm by bobpursley

Physics
It depends on the friction. If you ignore friction, zero work.
Wednesday, October 15, 2008 at 9:30pm by bobpursley

physics
A) Start with the definition of Work. Force x Distance B) Work = change in KE. This assumes negligible friction. They should have told you a value to assume for friction, or to neglect it. C) Same as B D) Use KE definition to get V. The "no friction assumption" had ...
Friday, February 25, 2011 at 8:18pm by drwls

Science
I did not see your question earlier. Air friction and internal friction in the joints of the body, especially the knees and ankles, must be overcome when walking. Neither are very large at normal walking speeds. The friction of your feet on the ground does not have to be ...
Wednesday, January 6, 2010 at 8:24pm by drwls

science-physics
1) All answers are wrong. If you needed friction to stay on a ladder, you'd be in trouble. Isn't the man staning on the ladder? You can't have a friction force without a normal force 2) A agree with marble having the least friction. Is it easier to slide on a ...
Saturday, February 14, 2009 at 9:06pm by drwls

physics
A block of ice at 0°C whose mass initially is m = 12.5 kg slides along a horizontal surface, starting at a speed vo = 4.10 m/s and finally coming to rest after traveling a distance d = 10.07 m. Compute the mass of ice melted as a result of the friction between the block ...
Tuesday, December 8, 2009 at 8:38pm by AK

physics
Yes, that's it! The (kinetic) friction coefficient times the weight is the friction force that must be applied.
Wednesday, October 13, 2010 at 1:55am by drwls

Physics
The co-efficient for static friction for a 5 kg box on a floor is .72. How much force if required to start the box sliding? I worked it as follows: Force of friction=Force normal * co-effic. of friction which is .72*5*9.8=35.28 but answer in back of my book says this is wrong...
Tuesday, March 31, 2009 at 5:07pm by CC

physics
sand has more friction or less friction
Tuesday, August 21, 2012 at 11:36am by liza

physics
why is static friction bigger than kinetic friction
Thursday, December 9, 2010 at 6:40pm by Michelle

Science
HELP! I have a friction question that says: What causes rocks to become smooth and founded. I know it's friction, but why?
Thursday, April 28, 2011 at 2:44pm by Ravin

Physics
Static friction force = 8.0 N = (static friction coefficient) x M g M = 2.0 kg; g = 9.8 m/s^2 Solve for the static friction coefficient
Tuesday, September 25, 2007 at 7:12pm by drwls

physics
A child pushes a toy box 4.0m along the fllor with a force of 6.00N directed downward at an angle of 37.0 degrees to the horizontal. a. How much work does the child do? b. Would you expect more or less work to be done if the child pulled upward at the same angle? Wouldn't ...
Wednesday, September 13, 2006 at 7:46am by fluffy

Physics
A car parked on a hill. The driver starts the car, accelerates until the car is driving at constant speed, drives at constant speed, then brakes to put the brake pad in contact with the spinning wheels. How is static friction, sliding friction, rolling friction, and air ...
Friday, February 17, 2012 at 5:46pm by Micheal

physics
how much work (J) is done by friction when the mass is 150 kg and dragged for 10 m if the coefficient of sliding friction is .3?
Monday, February 4, 2013 at 5:35pm by Jamie

Physics
the coefficient of friction between a 78 kg box and a warehouse floor is .21. what is the friction force?
Wednesday, November 2, 2011 at 10:18am by Bailee

Physics
We can account for the energy lost to friction for a sliding object as... would it be friction force/time traveled?
Saturday, September 25, 2010 at 1:06pm by Angela

physics
would the energy lost to friction for a sliding object be accounted for as friction force / time traveled ? ?
Friday, September 24, 2010 at 11:17am by laura

science
1a-b)what are the four types of friction what factors affect the friction force between two surfaces
Tuesday, October 20, 2009 at 8:38pm by sophie

physics
yeah the coefficient of static friction is 0.5 and coeffient of kinetic friction is 0.4. theta is measured below the horizontal
Sunday, September 13, 2009 at 5:47pm by Jessi

Physics
You push your couch a distance of 3.8 m across the living room floor with a horizontal force of 180.0 N. The force of friction is 136.0 N. What is the work done by you, by the friction force, by gravity, and by the net force? you 1 friction force 2 gravity 3 net force 4
Tuesday, September 21, 2010 at 1:13pm by Gina

Physics
okay so this is what i did to find the work done by overcoming friction: Ff = .9 N d = .91 m (Ff x d = Wf --> .9 x .91 = .82 J) hmm okay so how would you find the work done by friction using that calculation that you just said (change in total energy = work done by ...
Sunday, December 16, 2007 at 2:26pm by Hayley

Physics
friction would assist tension, as it resists motion along the chord 60N<mv^2/r - friction
Friday, December 24, 2010 at 11:32pm by bobpursley

Physics
constant speed, no friction? the force of gravity downwards is 700Nsin15*cos25 Because there is no friction, then P must equal that value.
Tuesday, October 5, 2010 at 10:39am by bobpursley

physics
Friction in a particular sideways direction. There is also forward/backward friction when accelerating, decelerating or climbing hills
Saturday, February 21, 2009 at 1:30pm by drwls

phyzzzics
I NEED ANSWERS AND HOW YOU GOT IT~!! 3. If you use a horizontal force of 30.0 N to slide a 12.0-kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? 4. A force of 4.0N is large enough to overcome ...
Sunday, December 6, 2009 at 2:37pm by johnica!

physics
First, convert speed (V) to units of m/s. 42.4 km/h = 11.78 m/s Initial kinetic energy = Work done against friction (1/2)MV^2 = M*g*Uk*X M cancels out. X = V^2/(2*g*Uk) is the stopping distance, if the car is skidding. If the brakes manage to apply the maximum force that ...
Saturday, April 2, 2011 at 10:54pm by drwls

Physics
My experiment setup was like this: i48.tinypic. com/14n31pl.jpg FYI, there is sandpaper between the ruler and the wall. I calculated the coefficient of friction to be 0.468. Is that correct? A second question asks that as the hanging weight is moved closer to the wall, what ...
Friday, November 30, 2012 at 3:37am by Jeras

math
The work that has to be done to accomplish this task depends upon the friction between the box and the ramp. If there is no friction, multiply the weight (6 lb) by the elevation change (6 sin 30) to get the work done, in foot-pounds. That will in all cases equal the change in ...
Tuesday, January 27, 2009 at 11:53pm by drwls

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