A mass is hanging on a spring balance which is kept in a lift. The lift ascends. The spring balance will show in its readings(a) an increase(b) a decrease(c) no change(d) a change depending on its velocity
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It will show an increase
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Answer: The correct answer is "an increase".
Explanation:
The net force acting on the mass hanging in the lift when the lift is going upward is R= m(g+a).
Here, R is the force of reaction, m is the mass of the object and g is the acceleration due to gravity.
The net force acting on the mass hanging in the lift when the lift is going downward in direction is R= m(g-a). Here, the apparent weight of the mass becomes less than its actual weight.
The apparent weight of the mass hanging on a spring becomes more than its actual weight when the lift is accelerating upward. The spring balance will show in its reading an increase.
Therefore, the correct option is (a).
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