Which of the following is not an example of a contact Force?

Picking up a backpack

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Earth's gravitational force

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Pushing a box

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Halting of a train on applying brakes

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Solution

The correct option is B Earth's gravitational force
Earth's attractive force or gravitational force acts on an object even when not in contact. Rest of the options involve contact of the object with the agent applying the force.

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Similar questions

A train slows down on applying brakes. Which of the following depicts the energy transformation that takes place?

40 m s^{- 1}

20 s

20 m s^{- 1}

5 s

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