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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

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.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.