First slide

Second law

Question

A force f varies with time in accordance with the following figure.The mean force for one cycle.

Easy

A

F₀
B

F₀/2
C

2F₀
D

Zero

Solution

$\large <F>=\frac{Area\;under\;F-t\;graph}{Time}$
Over a complete cycle , net area under F - t graph is zero .
.: Mean Force = 0

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