P05_energy3

# P05_energy3 - Fig 1 Parachutist jumping from an MV-22...

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Unformatted text preview: Fig 1: Parachutist jumping from an MV-22 Osprey ( DOD ) t jumping from an MV-22 Osprey ( DOD ) Energy Energy Name: Name: Teammates: Teammates: Introduction In this week’s lab, we are going to investigate the motion of objects from an energy perspective. We will relate the position and velocities of objects to their energies and not to the forces acting on them. In the absence of external forces to the system, no net work will be done on the objects, which means that the total energy of the system will remain constant. Two Types of Energy All forms of energy can be classified into either kinetic energy or potential energy. The energy of an object is equal to its ability to do work. It has the ability to do work on other objects by applying a force to those objects and change their velocity. Kinetic energy is the energy that an object has because of its motion relative to its surroundings. Potential energy is the energy that is stored in a system by virtue of forces between objects that are separated by some distance. If the objects are allowed to move under the influence of the force between them, then work is done as the force displaces the objects from their initial positions, and energy is transferred. A prime example of this is gravitational potential energy. Kinetic Energy If an object is moving, it has kinetic energy. For example, a cue ball that is rolling across the table has kinetic energy relative to the other static billiard balls on the table. If the cue ball hits another ball, it applies a force to the second ball over a very small distance. This force changes the cue ball's velocity while it transfers energy to the static ball, and thus, it does work. We define the kinetic energy of an object as K.E. = ½ mv 2 Gravitational Potential Energy One of the more important forms of potential energy in our lives is gravitational potential energy. This is the energy that comes about because of gravitational forces between objects, such as yourself and the Earth. A ball that is dropped from rest at some height above the Earth's surface will begin to accelerate downward as gravity pulls it. As the ball accelerates, gravity works on it to convert its potential energy into kinetic energy (the ball's height decreases as its velocity increases). If the ball is dropped from a higher altitude, then gravity...
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P05_energy3 - Fig 1 Parachutist jumping from an MV-22...

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