When a ball drops onto the floor it bounces. Why does it bounce ?

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Submitted by examrobotsa on

Q: 97 (CDS-II/2011)
When a ball drops onto the floor it bounces. Why does it bounce ?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,13,53,51,13,2,0

keywords: 

{'bounce': [0, 0, 0, 1], 'ball': [1, 3, 13, 12], 'impact': [3, 0, 1, 7], 'newton': [0, 1, 0, 0], 'drop': [0, 0, 0, 1], 'floor': [1, 1, 1, 5], 'force': [0, 0, 0, 2], 'third law': [0, 0, 0, 1], 'reaction': [1, 0, 5, 18]}

The correct answer is option 2: The floor exerts a force on the ball during the impact. When a ball drops onto the floor, it bounces because of the force that the floor exerts on the ball.

Option 1 states that Newton`s third law implies that for every action (drop), there is a reaction (bounce). This is a valid statement, as Newton`s third law states that every action has an equal and opposite reaction. However, it does not directly explain why the ball bounces when it hits the floor.

Option 3 suggests that the floor is perfectly rigid. While this may be true in some cases, the rigidity of the floor does not directly impact the bouncing of the ball.

Option 4 states that the floor heats up on impact. This is not a valid explanation for why the ball bounces. The heating of the floor does not play a role in the ball`s rebound.

In conclusion, the correct answer is option 2 because the floor exerts a force on the ball during the impact, causing it to bounce.