GRAVITATIONAL POTENTIAL ENERGY MR T VIDEO VIDEO POTENTIAL

POTENTIAL ENERGY An object can store energy as the result of its position. The

KINETIC ENERGY Kinetic energy is the energy of motion. Potential energy is stored energy.

TODAY WE ARE TALKING ABOUT. . Gravitational potential energy!!!! Gravitational potential energy is the

GRAVITATIONAL POTENTIAL ENERGY There is a direct relation between gravitational potential energy and the

LETS LOOK AT THE EQUATION PEgrav = m • g • h In the

IMPORTANT In this class you will not be asked to do calculations on a

EXAMPLE A rock that has a mass of 20 kg is on a cliff

ANSWER The GPE would increase because h in the equation PEgrav = m •

ANSWER The GPE would decrease because the m in the equation PEgrav = m

PENDULUM At which point(s) does the pendulum have the most potential energy? At which

PENDULUM At point “D” the pendulum is ________ kinetic energy because it is _________

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GRAVITATIONAL POTENTIAL ENERGY MR. T

VIDEO

POTENTIAL ENERGY An object can store energy as the result of its position. The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

KINETIC ENERGY Kinetic energy is the energy of motion. Potential energy is stored energy. (no motion).

TODAY WE ARE TALKING ABOUT. . Gravitational potential energy!!!! Gravitational potential energy is the energy stored in an object as the result of its vertical position or height. The energy is stored as the result of the gravitational attraction of the Earth for the object

GRAVITATIONAL POTENTIAL ENERGY There is a direct relation between gravitational potential energy and the mass of an object. More massive objects have greater gravitational potential energy. There is also a direct relation between gravitational potential energy and the height of an object. The higher the height the more potential energy.

GRAVITATIONAL POTENTIAL ENERGY

LETS LOOK AT THE EQUATION PEgrav = m • g • h In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9. 8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.

IMPORTANT In this class you will not be asked to do calculations on a test or quiz. BUT you should be able to tell me if the Gravitational potential energy would decrease or increase if I change variables in the equation.

EXAMPLE A rock that has a mass of 20 kg is on a cliff that is 20 m high. How would the Gravitational potential energy change if it was on a cliff that was 30 m high?

ANSWER The GPE would increase because h in the equation PEgrav = m • g • h is increasing.

EXAMPLE A rock that has a mass of 20 kg is on a cliff that is 20 m high. How would the Gravitational potential energy change if it was on a mass of the rock only 15 kg?

ANSWER The GPE would decrease because the m in the equation PEgrav = m • g • h is decreasing.

GPE IN A PENDULUM

PENDULUM At which point(s) does the pendulum have the most potential energy? At which point(s) does the pendulum have the most kinetic energy? Name two point where the pendulum is increasing in kinetic energy.

PENDULUM At point “D” the pendulum is ________ kinetic energy because it is _________ its speed. Meanwhile it is ________ potential energy because it is _________ its height.