Your friend is on rollerblades holding a pendulum. You gently push her forward a

Question

Your friend is on rollerblades holding a pendulum. You gently push her forward and let go. You observe that the pendulum first swings in the opposite direction (backward) and then returns to the vertical orientation as she coasts forward.

A)Choose the correct force diagram of the pendulum bob (in inertial reference flame) as your friend is being pushed. y-direction is the vertical direction.

B)The angle the pendulum bob makes with the vertical is ?. Determine the acceleration of your friend while you are pushing her.

Explanation / Answer

here the second figure is showing that the pendulum first swings in the opposite direction (backward) and then returns to the vertical orientation as she coasts forward.

so the correct answer is the second fig.

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