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Mechanics 3

# Mechanics 3 - Mechanics 3 Work The is the force which you...

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Mechanics 3

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Work The is the force which you times the distance Pushing a block twice as far takes twice as much work. Work lifting a mass m to a height h
Energy Energy : the capacity to do work. There are at least two forms of mechanical energy with which you are familiar: kinetic energy : a moving hammer has the potential to drive a nail gravitational potential energy : an apple which is high on a tree can hurt someone if it falls

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Gravitational Potential Energy: where is the height . The higher the object is, the greater its gravitational potential energy: more work has to be done to raise it to that height and the object can do more work if it falls. The more massive the object, the greater it’s gravitational potential energy.
Energy – the unit Recall that energy is the capacity to do work, and work is: Therefore, the units of work and energy are: Newton meters This is called the Joule:

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Kinetic Energy The faster an object moves, the more kinetic energy it has because it can do more work (and it takes more work to get it to this speed). The more massive the object is, the more kinetic energy it has, if it is moving.