ENERGY The stuff that makes things go.. What is Energy? - Energy = The ability to do work or cause a change in motion. -Measured in Joules (J) & calories.

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Presentation transcript:

ENERGY The stuff that makes things go.

What is Energy? - Energy = The ability to do work or cause a change in motion. -Measured in Joules (J) & calories (cal)

What are the different forms of Energy? Kinetic Energy Potential Energy Thermal, or heat energy Chemical Energy Electrical Energy Electrochemical Energy Electromagnetic Energy (light) Sound Energy Nuclear Energy Mechanical Energy

Potential Energy - Potential energy is energy due to position or stored energy. -Potential energy is also called gravitational potential energy. - PE = m g h -Where m is mass, g is gravitational acceleration and h is height - Gravitational acceleration on earth is 9.8m/s 2

Examples of Potential Energy By stretching a rubber band, you give it potential energy. A vase on a shelf has stored potential energy. A football being held by a quarterback has potential energy until it is thrown and it turns into kinetic energy.

Kinetic Energy -Kinetic energy is the energy of motion. -Kinetic energy is measured by how much work is done to put an object in motion or to rest. - KE = ½ m v 2 - Where m is mass and v is velocity.

Example of Kinetic Energy A basketball player has kinetic energy. The movements that she does show the energy that is being displayed while she is moving. When you are running, walking, or jumping, your body is exhibiting kinetic energy.

Types of energy?????

Example of both potential and kinetic energy. A waterfall has both kinetic and potential energy. The water at the top of the waterfall has stored potential energy. Once the water leaves the top of the waterfall, the potential energy is changed into kinetic energy.

What is work? Work is the ability to move an object a distance When you push a car you only do work when the car moves. If the car doesn’t move you are not doing work no matter how much you push.

Formula for work Work = Force * Distance W= Fd Work is in Joules (J) Force is in Newtons (N) Distance is in meters (m)

Conservation of Energy -Energy cannot be created or destroyed; it can only be changed from one of form of energy to another form. - The amount of energy stays the same.