A pendulum rod moves from the vertical position. Which of the following statements is false?
A) The pendulum stops after reaching a certain height and then swings back.
B) The pendulum describes a circular arc during its motion.
C) In the absence of friction, the pendulum tends to come to a stop after a certain time
D) In the absence of friction, the motion is simple harmonic oscillation.
E) In the presence of friction oscillatory motion is damped.
IMAT 2024 · Question 60
Q60 - Harmonic motion
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The correct answer is C) In the absence of friction, the pendulum tends to come to a stop after a certain time.
C is the false statement. Without friction, no energy is lost, so the pendulum would swing forever. It's friction and air resistance that make a real pendulum stop.
The others are all true: it stops at the top of each swing and comes back, it moves along an arc, without friction it's simple harmonic (for small angles), and with friction the swings die down.
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