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If you ever bounced a ball, you have experienced the conservation of energy or at least nearly the complete conservation of energy. When you drop a ball onto the ground, it bounces back up, nearly to your hand. The mass of the ball hasn't changed, remember that mass is conserved in any physical or chemical change. A simple change of position would conserve mass as well. The same can be said for the ball's energy, although this conservation is harder to observe. Explore the behavior of energy during changes in position, speed and energy.

The conservation of energy states that mass and energy is neither created nor destroyed in chemical and physical changes, it simply changes form. Energy can transfer from one system to another but is never decreased or increased. As energy is added to a system the potential to do work is increased and the kinetic(motion) energy increases as the energy of the system is used.


QUESTION

1. Describe the behavior of the moving object and the conservation of energy
2. How and why does energy changes with moving objects
3. Energy conservation when changes in speed and position occur

Respuesta :

1. As you drops a ball, its potential energy is converted into kinetic energy during its fall. It moves faster and faster as more PE is converted into KE until the ball hits the ground.

2. The conversion from PE to KE is due to the work done by gravity acceleration. As the ball is accelerated by gravity towards ground, its PE is converted to KE.

3. Total energy of the ball is conserved. Its position changes as it gets closer to the ground. Its PE decreases as its speed and hence KE increases until it hits the ground.

1. dropping the ball converts potential energy PE to kinetic energy KE. when ball hits ground, it bounces back up. KE is converted back to PE at dat pt. cuz' ball bounces back almost up 2 ur hand, the PE is almost conserved.

2. energy changes with ball as it is accelerated by gravity. the increase in velocity converts ball's PE to its KE.

3. two changes in speed n position: first during drop of ball. speed from zero at hand postion to its max at ground position. second during the bounce back. speed from max at ground poisiton to zero at almost hand position.

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