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Question

Which of the following quantities are always zero in SHM?

A
F×a
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B
v×r
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C
a×r
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D
F×r
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Solution

The correct options are
A F×a
B v×r
C a×r
D F×r
In SHM F, r, v and a are always along the same straight line either in the same direction or in opposite directions, so the angle between any of the pairs is either 0 or 180 and sin0=sin180=0. So cross product of any of the pair will also be equal to zero. Hence all options are correct.

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