# Phyics

If a 68kg object is being pulled across the hard floor with a horizontal force of 400N...

a. What would the acceleration of the object be if it was on a frictionless floor?
b. if there were friction, what would the force of friction be if it was pulled at a constant velocity?
c. If it wasn't at a constant velocity, but instead accelerating at 3.2m/s^2, what would the force of friction be acting on the object?
d. What would the coefficient be when the object accelerates at 3.2m/s^2

Thanks!

1. 👍 0
2. 👎 0
3. 👁 210
1. a. Try using Newton's second law. (F = ma)
b. Ditto. acceleration (a) equals zero. What does that tell you about the net force?
c. Again, use Newton's second law
d. Use the definition of the coefficient of (kinetic) friction, together with the friction force and the weight.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

A 5.1–kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 25° above the horizontal, as shown below. (a) What is the acceleration of the block? (b) The force P is slowly

asked by Chrxeyshthoufov on February 23, 2014
2. ### physics

A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 below the horizontal and the chair slides along the floor.Using Newton's

asked by Mary on September 23, 2009
3. ### science

A chair of mass 15.5 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 42.0 below the horizontal and the chair slides along the floor.Use

asked by John on August 3, 2012
4. ### Physics

A concrete block of mass 35kg is pulled along a horizontal floor with the aid of a rope inclined at an angle of 30 degrees to the horizontal. If the coefficient of the friction is 0.75. Calculate the force required to move the

asked by Blessing on August 27, 2019
1. ### PHYSICS

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 450 N. For the first 11 m the floor is frictionless, and for the next 11 m the coefficient of friction is 0.30. What is the final

asked by REESE on March 17, 2010
2. ### physics

52.(52G) A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What is the

asked by Martha on March 23, 2014
3. ### physics

A 1.8 kg object is pulled along the floor with a force of 7.0 N acting horizontally. If the object accelerates at 2.4m/s^2, how much kinetic friction is acting? how do i do this? could you please explain step by step

asked by kerri on December 3, 2009
4. ### physics

a 2.0kg object is pulled horizontally by a force of 6.3N along the floor where the coefficient of kinetic friction is o.24. what is the object acceleration

asked by liz on January 26, 2012
1. ### physics

A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 420 N. For the first 13 m the floor is frictionless, and for the next 13 m the coefficient of friction is 0.35. What is the final

asked by Cara on April 6, 2011
2. ### physics

A 4.5 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.50 N at an angle theta=30.0 degrees above the horizontal. What is the speed of the block 5.50 seconds after it starts moving?

asked by jessie on February 10, 2011
3. ### Physics

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. The work done on object A is 500J. After the force pulled each object, object A moves twice as

asked by Tim on December 9, 2012
4. ### Physics

A man pulls a 300N object across a horizontal surface using a 100 N force applied at a 35 degree angle. What is the normal force? If the object is pulled at constant speed, what is the coefficient of friction?