Question

A toy to play with: Take an empty match box. Take out its tray. Cut a used refill of a ball
pen of the same width as the tray as shown in the figure below. Fix the refill with two
pins on the top of the tray as shown in Figure Make two holes on the opposite sides of the
tray. Make sure that the holes are large enough to allow a thread to pass through them
easily. Take a thread about a metre long and pass it through the holes as shown. Fix beads
at the two ends of the thread so that it does not come out. Insert the tray in the outer cover
of the matchbox. Suspend the match box by the thread. Leave the thread loose. The
match box will start falling down due to gravity. Tighten the thread now and observe
what happens. Explain your observation. Can you relate it to friction?

Answer 1

Answer:

if a simple pendulum of length L and mass m has maximum angular displacement theta, the find its maximum kinetic energy