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Phys Notes Feb4th - Y7-ch7 1(Test 1 covers material of...

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Y7-ch7 1 (Test 1 covers material of Chapters 1 - 6. Formula sheet will be provided with the test.) Key Concepts Potential energy is energy associated with the position of a system rather than its motion. Examples are grav- itational potential energy (for a body acted on by the earth’s gravitation) and elastic potential energy (stored in a stretched or compressed spring). The work done on a body by certain forces (called con- servative forces) can be expressed as a change in poten- tial energy. When all the forces that do work on a body are conservative, the total mechanical energy of the sys- tem (kinetic plus potential) is constant. Otherwise, the change in the total energy equals the work done by the forces not included in the potential energy.
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