The diagram below shows a simple pendulum that swings backwards and forwards between P and Q.

a. The time taken for the pendulum to swing from P to Q is approximately 0.5 s. Describe how you would determine this time as accurately as possible.

b. i. State the two vertical forces acting on the pendulum bob when it is at position R.

ii. The pendulum bob moves along the arc of a circle. State the direction of the resultant of the two forces in 1.

c. The mass of the bob is 0.2 kg. During the swing it moves so that P is 0.05 m higher than R. Calculate the increase in potential energy of the pendulum bob between R and P [g = 10 N/kg]. [2]

Transcribed Image Text:

support string R pendulum bob