Question

State the condition when a body is in (i) static equilibrium. (ii) dynamic equilibrium. Give one example each of static and dynamic equilibrium.

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Answer

(i) When a body remains in the state of rest under the influence of several forces, the body is said to be in static equilibrium.

Example — A toy lying on a floor is in static equilibrium.

(ii) When a body remains in the same state of motion (translation or rotational), under the influence of several forces, the body is said to be in dynamic equilibrium.

Example — An apple falling from a tree with a constant velocity.

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