In order to slide a heavy desk across the floor at constant speed in a straight line, you have to exert a horizontal force of 800 newtons. compare the 800-newton horizontal pushing force f to the frictional force f between the desk and the ground.

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08-12-2017
Physics

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In order to slide a heavy desk across the floor at constant speed in a straight line, you have to exert a horizontal force of 800 newtons. compare the 800-newton horizontal pushing force f to the frictional force f between the desk and the ground.

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shinmin shinmin · Answer 1 · 2017-12-18T13:47:10+01:00

The hint is "constant speed".
If there is a net force on an object, what occurs to that object? F net = m*a.... It accelerates!
So, if the desk is going at a CONSTANT speed, what does that tell you about the acceleration? There is a change in speed.
Fnet = m*a Since a = 0 Fnet = 0
Fnet = sum of the force... reflect the direction of F as the positive direction. Sum of the forces in the direction of F = 0 0 = F - friction F = friction
So, if F = 800 N, then friction = 800 N in the opposite direction.