a skateboard rolls down a hill and the wheels do not slip against the pavement. does the static friction force of the pavement on the wheels do any work on the skateboard? g

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08-11-2022
Physics

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a skateboard rolls down a hill and the wheels do not slip against the pavement. does the static friction force of the pavement on the wheels do any work on the skateboard? g

Answer :

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AnnuG AnnuG · Answer 1 · 2022-11-11T08:03:24-05:00

The static friction force of the pavement on the wheels will not do any work on the skateboard.

Static friction is a variable resisting force that is equal and opposite to the external force until it exceeds the motion threshold when sliding begins.

It is also called as self adjusting force.

If the skateboard is rolling at a constant speed without any other forces acting on it, then there is no tendency to slip between the wheel and the surface, so there is no frictional work. Friction will only try to prevent slipping between the 2 surfaces.

On an inclined plane, the wheels will tend to slide down, and if there were no friction, it would again slide between the wheels and the inclined surface. Perhaps friction will always try to counteract the slip, so here it acts upward on the slope to try to prevent the skateboard from sliding down the slope. This has the effect of applying a moment to the skateboard causing it to roll.

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