answer in 1, 2, 3, 4, 5, 6, 7, 8 Which of follow forces do work? the wing Check

Question

answer in 1, 2, 3, 4, 5, 6, 7, 8

Which of follow forces do work? the wing Check all that apply. The weight of a ball that rolls, without slipping, on a flat surface. The normal force on a stationary crate The frictional force on a crate sliding down a ramp. The frictional force on a crate that is being pushed across a flat floor A compressed spring that is allowed to expand The weight of a ball that rolls without slipping, down a ramp. The reaction force on a pin support. A stretched spring that is allowed to contract

Explanation / Answer

3,4, 5, 6,8 key - just see if force is perpendicular to displacement. in that case work will be 0. for example normal force on flat surface is perpendicular to displacement. let me know if you need more..

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