Example

• A small body of mass 0.12 kg is undergoing SHM of amplitude 8.5 cm and period 0.20 s

• (a) what is maximum force?(b) if the motion is due to a spring, what is k?

• What do we have to know?

• (1) F=ma (2) F=-kx (3) a= - ?2x

• or in other words x(t)=xm cos(?t+?)

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