# friction

7,500 results

### Physics fundamentals

When a crate is moving on a track where friction is not negligible. The friction force is said to be kinetic friction static friction Non existant

### 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

What is friction? Can you give me some examples? -THANK YOU FOR ALL YOUR HELP! friction: Ever have a pinwheel and move it through 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 ...

### 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...

### 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 ...

### Physics

Could you explain these in a very easy term that I could understand, give the definitions of the 3 thing below Static Friction Dynamic Friction Rolling Friction

### 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 ...

### 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?

### 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?

### physics

Consider a ladder placed against a frictionless wall. What happens to the friction force between the ladder and the floor as you climb up the ladder? (Assume the ladder is not sliding.) A. The friction force decreases. B. The friction force remains the same. C. The friction ...

### science

a person roller skates down a street heading east which of the following would be true abot friction in this scenario? ----------------------------------- 1.A. friction does not affect the skates in this scenario 2.B. friction pulls the skates wheels eastward 3.C. friction ...

### 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 ...

### 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.

### SCIENCE 1 QUESTION PLS HELP!!!!!

3. Which of the following describes the relationship between friction and inertia? (1 point) When there is more friction, there is less inertia. When there is less friction, there is more inertia. When there is more friction, there is more inertia. When there is no friction, ...

### 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" connotes going ...

### 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?

### Physics

Why is the coefficient of kinetic friction generally less than the coefficient of static friction? Fk<Fs http://en.wikipedia.org/wiki/Friction

### Science

1) A person roller skates down a street heading east. Which of the following would be true about friction in this scenario? a; friction does not affect the skates in the scenario b; friction pulls the skates wheels eastward c; friction pulls the skates wheels downward, toward ...

### 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.

### Science

Which of the following describes the relationship between friction and inertia? When there is more friction, there is less inertia. When there is less friction, there is more inertia. When there is more friction, there is more inertia. When there is no friction, there is more ...

### 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?

### 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, ...

### 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, ...

### 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, ...

### 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 ...

### 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 and ...

### 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...

### Physics

The lower half of an inclined plane is rough the upper half being smooth a particle is allowed to slide from the top and is brought to rest by friction just as it reaches the bottom, find the ratio of the force of friction to the weight of the particle intermes of the ...

### Physics

The lower half of an inclined plane is rough the upper half being smooth a particle is allowed to slide from the top and is brought to rest by friction just as it reaches the bottom, find the ratio of the force of friction to the weight of the particle intermes of the ...

### 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 ...

### 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?

### physicsss

A sled weighing 200.0 N is pulled along a horizontal surface with a horizontal force of 45 N. The coefficient of static friction is 0.65 and of kinetic friction is 0.40. What is the force of friction? So I got Ff=200*.4= 80N

### physics

a 20-kg box sits on a level floor. the coefficient of kinetic friction between floor and box is 0,60. how large a friction force opposes the motion of the box while moving? how much work must be done against friction to move the box 5,0 m?

### physics

a student wants to determine the coefficient of static friction and kinetic friction between a box and a plank by gradually raising one end of the plank. when the angle of inclination with the horizontal reaches 28.0, the box starts to slip and slide 2.53 m down the plank in 3...

### 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, ...

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 on...

### Physics/Math

A 17 N horizontal force F pushes a block weighing 6.0 N against a vertical wall. The coefficient of static friction between the wall and the block is 0.68, and the coefficient of kinetic friction is 0.48. Assume that the block is not moving initially. Will the block move? In ...

### 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 ...

### 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.

### 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 friction is?

### 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?

Two people, one of mass 51.4KG and the other mass of 78.0 KG, sit a distance between of 2.3 metres apart on a low friction sleds with the same friction coefficients. A)what is the strength of the gravitational force between them? B) suppose the friction is slowly reduced until...

### Physics (Static Friction)

When you take your 1300-kg car out for a spin, you go around a corner of radius 56.9 m with a speed of 15.8 m/s. The coefficient of static friction between the car and the road is 0.75. Assuming your car doesn't skid, what is the force exerted on it by static friction? I got ...

### 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 ...

### 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 this...

### science

Our 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.4 and the coefficient of kinetic friction is 0.3. Determine the force of friction acting on the box if a horizontal external applied force is exerted on it of magnitude: • (a) 0, (b) 10...

### physics

A 74 kg box rests on a level surface. The coefficient of static friction, µS = 1.1 and the coefficient of kinetic friction, µK = 0.7 . What is the magnitude of Friction on the box from the surface?

### Physics

the coefficient of friction between a 78 kg box and a warehouse floor is .21. what is the friction force?

### Physics

Friction is usually the killer of efficiency. How does a ramp relate to friction?

### Physics

show that, the tangent of the angle of friction is equal to the coeficient of friction.

### 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?

### Physics

A 100-kg object rests on a level surface with a coefficient of friction (both kinetic and static) of 0.40. If the initial velocity is 15m/s and the object comes to rest, (a) how much friction is acting on the object? (b) What is the objects 's acceleration due to friction? (c...

### science

1a-b)what are the four types of friction what factors affect the friction force between two surfaces

### Science

HELP! I have a friction question that says: What causes rocks to become smooth and founded. I know it's friction, but why?

### physics

whtas mu? the cof of friction? or mass or the coef of friction?

### friction

State four examples in the workshop where friction is desired ?

### physics

would the energy lost to friction for a sliding object be accounted for as friction force / time traveled ? ?

### Physics

We can account for the energy lost to friction for a sliding object as... would it be friction force/time traveled?

### physics

a 5 kg box slides a 10m distance on ice. if the coefficient of kinetic friction is .20, what is the work done by the friction force?

### physics

Static friction is smaller than kinetic friction because it is harder to keep an object than moving than to put it in motion.

### 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 ...

### Physics 204

I have a few questions. 1.The coefficient of sliding friction between steel skate blades and ice is .05. How much force must be applied to a 150lb. skater to maintain a constant velocity? 2. If it takes a force of 6 pounds to cause a 24 pound box to slide on a level surface, ...

### Physics

Consider a car is heading down a 5.5° slope (one that makes an angle of 5.5° with the horizontal) under the following road conditions. You may assume that the weight of the car is evenly distributed on all four tires and that the coefficient of static friction is involved—...

### physics

why is static friction bigger than kinetic friction

### physics

sand has more friction or less friction

### Physics

A 2.32 kg block slide down a ramp from a height of 4.19 m. The block has a speed of 3.25 m/s when it reaches the bottom. There is friction. What is the work (in J) done by gravity? What is the work done by friction? I found the work of friction already. KE= .5m(v^2) KE= .5(2....

### friction

A 40 kg slab rests on a friction less floor.a 10 kg block rests on top of the slab.the coefficient kinetic friction between the block and the slab is 0.40.a horizontal force of 100N is applied on the 10 kg block.find the resulting acceleration of the slab.

### 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 ...

### 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

### Physics

A 12.0 kg object is on a surface that is inclined 30 degrees and the coefficient of friction is 0.65. Determine the force of static friction if the block remains stationary.

### Physics

A 12.0 kg object is on a surface that is inclined 30 degrees and the coefficient of friction is 0.65. Determine the force of static friction if the block remains stationary.

### Physics

A 12.0 kg object is on a surface that is inclined 30 degrees and the coefficient of friction is 0.65. Determine the force of static friction if the block remains stationary.

### physic

A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the force of friction. ...

### physic

A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the force of friction. ...

### Physics

A large crate filled with physics laboratory equipment must be moved up an incline onto a truck. 1. The crate is at rest on the incline. What can you say about the force of friction acting on the crate? a. The friction force point up the include b. The friction force point ...

### physics

when an object is rotating in a circle and the only force is acting on it is friction how is force of friction vector pointing towards the circle because an object in circular motion is traveling in that direction, it's accelerating towards the center of the circle, but ...

### physics

How much work would be done if a 50 kg block was pulled horizantally at a 30 degree angle to the horizantal for 10 meters. a) With zero friction b) With -100N friction

### physics

With friction turned on, set the initial velocity of the box to 1.75 m/s, the coefficient of friction to 0.60, and the mass to 1.5 kg. Assume the acceleration due to gravity has a magnitude of 9.8 m/s2.

### Physics

A car (1100kg) skids up a hill inclined at 6 degrees. Its initial speed is 20m/s and skids 50m before stopping. When it stops, how high is it above where it started? How much potential energy did it gain? How much energy was lost to friction? What is the force of friction (...

### Physics

A 1.00 kg box, initially at rest, is pulled across a table with a force of 3.00 N. (a) Will the box move if the coefficient of friction is 0.45? (b) What is the coefficient of friction if the box just begins to move? (c) What is the acceleration of the box if the coefficient ...

### pHySiCs

Two identical 5 kg masses are connected together by a string and a friction less pulley of negligible mass. The coefficient of friction between the mass on the 30 degree incline and the below surface is .200. The other incline's surface is friction less. Determine the ...

### Static Friction..I really Have no Idea

A 0.40 kg block rests on a desk. The coefficient of static friction is 0.20. You push the side of the block but do not have a spring scale to measure the force you use. The block does not move. Which statement is true about the force of static friction? It is no larger than 0....

### Physics

a box initially moving with a speed of 5m/s along a rough , horizontal floor , it stopped it after 5 m the conffenict friction is 0.3 find the work done by friction .

### welkin

a block of mass 50kg just slide distance of one metre if the coefficient of friction between their surface is 0.2,then work done against friction is

### Science

Which of the following forces causes a feather to fall slower then a bowling ball? A.gravity B.rolling friction C.sliding friction D.air resistance

### Physics

A 5kg object placed on a friction-less, horizontal table connected to a string that passes over a pulley and then is fastened to a hanging 9kg object. (A) Draw a free body diagram of both the objects. (B) The Coefficient of kinetic friction between the object and the surface ...

### PHYSICS

6. Drag-race tires in contact with an asphalt surface have a very high coefficient of static friction. Assuming a constant acceleration and no slipping of tires, estimate the coefficient of static friction needed for a drag racer to cover 2.1 km in 8 s, starting from rest. ...

### Physics

Please help me with these three questions. They deal with coefficient of friction 1) A car rounds a turn of radius 25m at a speed of 20m/s. Find the coefficient of friction neccessary to keep the car on the road 2) A man is attempting to slide a piece of furniture weighing ...

### Physics

Please help me with these three questions,they deal with coefficient of friction 1) A car rounds a turn of radius 25m at a speed of 20m/s. Find the coefficient of friction neccessary to keep the car on the road 2) A man is attempting to slide a piece of furniture weighing 750N...

### Physics

The 60 kg climber in Fig. 4-52 is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.82 and 0.58, respectively. What is the minimum normal...

### Physics

The 60 kg climber in Fig. 4-52 is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.82 and 0.58, respectively. What is the minimum normal...

### Physics

A trash can with a mass of 5 kg has a coefficient of static friction of μs = 0.80 and a coefficient of kinetic friction of μk = 0.22. (The Active Figure applies to a similar situation, but the values of the mass, coefficient of static friction and coefficient of ...

### science

Re identifying forces, thankyou to Rom for your help, ive now been able to do most of them. One's i am still stuck on are a bungee jumper, speeding train, cyclist speeding off a ramp and a shuttlecock falling to the ground. bungee jumper: cord tension and gravity, air friction...

### physics

A 70.0 kg climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.760 and 0.610, respectively. What is the minimum normal force he ...

### Physics

A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the surface? Am I right to...

### Science

A box that is initially at rest is pushed by a person at an angle 0 with a force F until it reaches a speed of v. The coefficient of kinetic friction between the box and the surface is U. Is this: work done by person equal to magnitude of friction F work done by person greater...

### Me again! - Science (Friction and Weight)

Okay. I have a test coming up soon, and I was wondering how to explain Weight and Friction. Mass is the stuff inside an object, so what is weight? And how do you describe friction? Thanks for reading, hope you can help. Weight is the attraction of an object as a result of ...

### Science

A 0.2 kg object is released from rest at point A on a track that is one-quarter of a circle with radius 1.6 m, as shown in the figure. It slides down and reaches point B with a speed of 4.8 m/s. Then it slides on a level surface a distance of 3 m until it comes to rest at ...

### Physic

6. A car is moving along a straight road at 60 mph [26.7 meter/sec ]. The driver makes slams on his breaks locking them so that the car skid s to a stop. Assume a constant braking force due to friction , and a kinetic friction coefficient of 0.70 between the tires and the road...

### physics

One last question: If a 12lb. block is slowly tilted from horizontal when the plank reaches 30 degrees the block begins to slide. To find the coefficient of the static friction you take the tangent form of 30 degrees? To find the friction force you multiply the coefficient of ...