Energy and Matter Imagine a pool ball that bounces off of a bumper and slowly comes to a halt. Explain what happened at each point in terms of applied forces and energy transfers.

The kinetic energy is transferred from the ball to the bumper. The bumper gives the same energy back and the ball eventually stopped due to friction of the ground.

Explanation:

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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