When does a ball bounce off the ground, which of the following changes suddenly? (Assume no loss of energy to the floor)

examrobotsa's picture

Submitted by examrobotsa on

Q: (NDA-II/2019)
When does a ball bounce off the ground, which of the following changes suddenly? (Assume no loss of energy to the floor)

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,9,22,1,9,9,12

keywords: 

{'kinetic energy': [0, 0, 4, 7], 'potential energy': [0, 0, 1, 4], 'momentum': [0, 1, 0, 3], 'ball': [1, 3, 13, 12], 'ground': [2, 1, 4, 17], 'energy': [0, 0, 1, 2], 'floor': [1, 1, 1, 5], 'speed': [0, 1, 2, 0]}

When a ball bounces off the ground, its momentum changes suddenly. Momentum is the product of an object`s mass and velocity. During the bounce, the ball experiences a change in velocity as it rebounds off the ground. This change in velocity causes a change in momentum.

Option 1: The speed of the ball does change during the bounce, but it does not change suddenly. The speed gradually increases or decreases depending on the nature of the bounce.

Option 2: The correct answer. As mentioned earlier, the change in velocity during the bounce results in a sudden change in momentum.

Option 3: The kinetic energy of the ball also changes during the bounce, but it does not change suddenly. The kinetic energy is related to the speed of the ball, and like the speed, it gradually increases or decreases during the bounce.

Option 4: The potential energy of the ball does not change during the bounce. Potential energy is associated with the position of the ball relative to the ground, and it remains constant as the ball bounces. Alert - correct answer should be option-2.