Simple 1:47 AM Close 5. You apply an identical horizontal force to two identical

Question

Simple 1:47 AM Close 5. You apply an identical horizontal force to two identical objects up two different ramps. The ramps rise to the same height, but one is steeper than the other as shown in the diagram below. Assume no friction in this case. (a) Assuming you are able to push the object to the top of their respective ramp, which would you expect to be traveling faster? (Rely on a common-sense approach rather than an appeal to physics) (b) From a work-energy vantage point, how can you justify the answer to (a)?

Explanation / Answer

a)

When the objects are pushed to the same heights then

both objects move with same speed

b)

When there is so friction then the work done against gravitational force is independent of the path followed.

There is only consversion from kinetic energy to potential energy.

Initial kinetic energy = Final poptential energy.

As both are moved to same height so their initial velocities are also same.

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