An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and 2.0 m high. If it requires 3200 J of work to get the box to the top of the plane, what was the magnitude of the average friction force on the box?
Ok I have no idea how to complete this problem. Any help would be awesome, thanks!
Ok I have no idea how to complete this problem. Any help would be awesome, thanks!
-
The potential energy PE at the top of the ramp is m*g*h = 800*2 = 1600J
If the potential energy was zero at the bottom of the plane and only 1600J as the top what happened to the 3200-1600= 1600J? It was consumed by friction and heated the plane and the box.
1600J = Ff*4m => Ff = 400N
Arcsin 2/4 = 30 degrees is the angle of the plane
Ff = 800cos30*Ckf => Ckf = 0.577
If this helps you, please vote best answer.
If the potential energy was zero at the bottom of the plane and only 1600J as the top what happened to the 3200-1600= 1600J? It was consumed by friction and heated the plane and the box.
1600J = Ff*4m => Ff = 400N
Arcsin 2/4 = 30 degrees is the angle of the plane
Ff = 800cos30*Ckf => Ckf = 0.577
If this helps you, please vote best answer.