A body of mass 2 kg is hung on a spring balance mounted vertically in a lift moving upward with an acceleration of 2 m/s². The reading on the spring balance will be
Correct answer: C. 24 kgm/s²
- A. 20 N
- B. 22 kgm/s²
- C. 24 kgm/s²
- D. 28 N
Explanation
The reading on the spring balance in a lift includes both the force due to gravity and the apparent weight due to the acceleration of the lift. The apparent weight is given by m(g+a), where m is the mass of the object, g is the acceleration due to gravity, and a is the acceleration of the lift. Substituting the values, we get 2(9.8+2)=2×11.8=24kgm/s^2.
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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.
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