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**Chapter 5 Section 1: What is Energy?**

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Energy

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**Energy is the ability to do work**

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**Work is done when a force makes an object move or change its direction.**

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Example When you kick a soccer ball, you are doing work on the ball and then the ball does work on the goal.

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**When one object does work on another, energy is transferred.**

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**Energy is expressed in the units Joules (J)**

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Kinetic Energy

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**Kinetic energy is the energy of motion**

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**Kinetic energy is the energy of motion**

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**All moving objects have kinetic energy.**

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**Kinetic energy depends on mass and speed**

Kinetic energy= mv2/2 M=mass V2=velocity2

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**To increase kinetic energy, increase the mass(m) or speed(v) of the object.**

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Potential Energy

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**Potential energy is the energy an object has because of its position**

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**There is more potential energy in a car on top of a hill than a car on a flat street.**

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**Gravitational potential energy is a transfer of energy to an object by lifting it in the air.**

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**Holding a ball over your head vs it resting on the ground.**

Example Holding a ball over your head vs it resting on the ground.

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**To calculate gravitational potential energy:**

weight x height

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**Weight is the amount of force needed to lift an object and height is a distance**

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Mechanical Energy

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**Mechanical Energy is the total energy of motion and position of an object**

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**potential energy+kinetic energy**

Mechanical energy= potential energy+kinetic energy

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**Other forms of energy Thermal Energy Chemical Energy Electrical Energy**

Sound Energy Light Energy Nuclear Energy

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