Following diagram shows a ball remaining stationery on the floor. What force enables the ball to remain in that position?

Gravity

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Friction

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Contact force

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Ball is following 1st law of newton , so as long as it is not disturbed form its state it will not requires any force to remain in this state.

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Solution

The correct option is D Ball is following 1st law of newton , so as long as it is not disturbed form its state it will not requires any force to remain in this state.
The earth applies a gravitational force $m g$ on the ball in downward direction. From Newton's third law, the floor applies a normal reaction $N = m g$ upwards. Thus net force acting the ball is zero and hence the ball remains stationary.

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