Which law of motion gives the quantitative definition of force?
Newton’s second law of motion gives the quantitative definition of force.
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Why do we pull the rope in downward direction for climbing up?
When a person is is climbing up he will push the rope downwards. Gravity is pulling the body downwards and when a person pulls the rope down, the reaction force will help that to person to climb upwards.
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What can set the body at rest into motion?
An unbalanced force has to set the body into motion which is at rest.
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What do you mean by mechanically isolated system?
When there is no external force acting on the system, it is said to be mechanically isolated.
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