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Representing and Analyzing SHM

AP Physics 1· difficulty 2/5

A mass oscillates as x(t)=Acos⁡(ωt)x(t) = A\cos(\omega t). At t=T/4t = T/4, where is it?

  • A

    x=0x = 0

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  • B

    x=+A/2x = +A/2

  • C

    x=+Ax = +A

  • D

    x=−Ax = -A

Explanation

ωT=2π\omega T = 2\pi, so ωt=π/2\omega t = \pi/2 at t=T/4t = T/4. cos⁡(π/2)=0\cos(\pi/2) = 0.

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