A simple pendulum suspended from the ceiling of a train has a period 'T' when the train is at rest. When the train is accelerating with a uniform acceleration, the time period of simple pendulum will:
Correct answer: A. Decrease
- A. Decrease
- B. Increase
- C. Remain unchanged
- D. Become infinite
- E. Insufficient information
Explanation
Understanding the concept:The time period of a simple pendulum is given by T = 2π√(L/g), where L is the length of the pendulum and g is the acceleration due to gravity. When the train accelerates, an additional pseudo force acts on the pendulum bob in the opposite direction of the train's acceleration. This pseudo force effectively increases the "effective gravity" experienced by the pendulum. 2. Calculating effective gravity:When the train accelerates horizontally with acceleration 'a', the pendulum bob experiences two accelerations: 'g' vertically downwards and 'a' horizontally. The effective acceleration (g_eff) is the vector sum of these two accelerations.g_eff = √(g² + a²) 3. Calculating the new time period:The new time period (T') will be:T' = 2π√(L/g_eff) = 2π√(L/√(g² + a²))4. Comparing T' and T:Since g_eff > g, the denominator in the equation for T' is larger than the denominator in the equation for T. Therefore, T' < T.Conclusion:When the train accelerates, the time period of the simple pendulum decreases.
Last updated
About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
Practise Waves
1,281 free Waves MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1 rev min-1 is equal to:
85.95° degree in terms of radian is
A 0.3 kg mass oscillates with amplitude 0.08 m. If its maximum kinetic energy is 0.096 J, what is the angular frequency?
A 0.5 kg mass on a spring (k = 50 N/m) is damped with a damping constant b = 2 kg/s. What is the damping ratio?
A 1 kg mass oscillates with SHM of amplitude 0.05 m and frequency 2 Hz. What is the total mechanical energy?