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Answers
Given Take a ping-pong ball. Release it from a height on a hard, smooth floor. You will observe that the ball after striking the floor bounces several times. Try to answer the following questions :
(a) What is the potential energy and kinetic energy
when you release the ball ?
(b) Why does the ball bounce back after striking
the floor ?
(c) From where does the ball get the kinetic energy
for motion after striking the floor?
(d) What happens to the energy of the ball when
the ball stops bouncing ?
Now the ball is released from a height, so the ball has potential energy and the kinetic energy is zero since the ball is at rest.
Now when the ball is released, potential energy is zero and kinetic energy is maximum.
After striking the floor the ball bounces back since for every action there is an equal opposite reaction according to Newton’s third law of motion.
Now from the ground which has potential energy.
As the ball stops bouncing, the kinetic energy is being converted into potential energy and hence the speed decreases.
Answer:
(a) When you release the ball, it begins to fall down the track acquiring a speed, v. The ball's potential energy (PE) is being converted into an equal amount of kinetic energy (KE)! At the bottom of the loop, all of the ball's energy is now kinetic energy.
(b)When the ball hits the ground, it is pressed with a force of gravity and other forces that was exerted on it. Due to these forces it's shape is deformed and to retain back its shape, its elastic nature exerts the same amount of force that deformed it. So the ball bounces until it gains back its shape.
(c)The balls are shown at rest, about to bounce back up. ... The answer lies in how far the ball has dented inward due to its collision with the floor. As it falls, the ball converts energy stored in the force of gravity—gravitational potential energy—into energy of motion—kinetic energy.
(d)If you drop the ball, the force of gravity pulls it down, and as the ball falls, its potential energy is converted to kinetic energy. ... This is because the ball had an inelastic collision with the ground. After a few bounces, it stops bouncing completely. The energy has left the ball!
During a collision, some of the ball's energy is converted into heat. As no energy is added to the ball, the ball bounces back with less kinetic energy and cannot reach quite the same height. ... It reaches way higher than from the height it was released.
As the ball falls, that energy is converted to kinetic energy. When the ball collides with the floor, some of this kinetic energy is transferred to the floor and converted to thermal energy (friction) and elastic potential energy (ball deformation.)
Step-by-step explanation:
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