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**Intro to Energy, Potential Energy, Kinetic Energy**

Karen Tino September 2013

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**Introduction to Energy**

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**S8P2. Students will be familiar with the forms and transformations of energy.**

b. Explain the relationship between potential and kinetic energy. EQ: : How does potential energy affect kinetic energy?

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**Words to Know work energy potential energy kinetic energy**

mechanical energy electrical energy thermal energy nuclear energy chemical energy law of conservation of energy gravitational potential energy electromagnetic energy elastic potential energy

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In Your Notebook: Title your paper: Introduction to Energy

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**Introduction to Energy**

How are energy, work, and power related?

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**Introduction to Energy**

You have just finished raking all of the leaves in the yard into a nice pile, when the wind spreads many of them around the yard again. You know that the wind is just moving air, but does it have energy?

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**Introduction to Energy**

Yes, the wind has energy. Energy is the ability to do work or cause change, so the wind has energy. Work is the force exerted on an object causing it to move.

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**Introduction to Energy**

In Your Notebook: Introduction to Energy Energy Energy is the ability to do work or cause change, so the wind has energy. Work is the force exerted on an object causing it to move. The term used for energy is Joules (J). This is also used to show the amount of work being done.

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**Reviewing Energy and Matter**

The two main forms of energy are potential and kinetic. Kinetic energy is the energy of matter in motion.

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**Reviewing Energy and Matter**

Certain factors affect an objects kinetic energy, and these factors are both its mass and velocity. Remember, mass is the measure of how much matter is in an object. Velocity is speed in a given direction.

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In Your Notebook: Kinetic Energy Kinetic energy is the energy of matter in motion. Examples: ____________ Factors that affect kinetic energy: a. mass – amount of matter b. velocity – speed in a given direction.

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**Introduction to Energy**

As an object’s mass increases, its kinetic energy also increases. Even if both of these trucks hit a wall at the same speed, the larger truck would cause more damage because it has a larger mass.

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**Introduction to Energy**

As an object’s velocity (speed) increases, its kinetic energy also increases. Although all of the cars may have the same mass, the car with the highest velocity (speed) has the greatest kinetic energy.

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**In Your Notebook: Kinetic Energy**

As an object’s mass increases, its kinetic energy also increases. As an object’s velocity (speed) increases, its kinetic energy also increases.

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**Reviewing Energy and Matter**

The two main forms of energy are potential and kinetic. Potential energy is the energy an object has because of its position or shape.

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In Your Notebook: Potential Energy Potential energy is the energy an object has because of its position or shape. Examples: __________

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**Introduction to Energy**

There are two types of potential energy, and the first type is gravitational potential energy. Gravitational potential energy is related to an object’s height. The greater an objects weight or height, the higher its gravitational potential energy.

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**Introduction to Energy**

Skier # 1 If two skiers of equal mass went to the top of these two ramps, which would have more gravitational potential energy? Skier # 2 Skier # 1 would have more gravitational potential energy because of the height.

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**Introduction to Energy**

There are two types of potential energy, and the second type is elastic potential energy. An object gains a different type of potential energy when it is stretched. Elastic potential energy is associated with objects that can be stretched or compressed.

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**Potential Energy Two types of potential energy:**

a. gravitational potential energy – related to the height of an object. Examples: _____________

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Potential Energy b. elastic potential energy - associated with objects that can be stretched or compressed. Examples: ______________

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**Vocabulary Review kinetic energy – potential energy –**

energy of movement potential energy – stored energy potential chemical energy – stored energy released by chemical changes mechanical energy – energy that is composed of both potential energy and kinetic energy.

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Independent Practice The students will complete at least 2 of the following hands-on activities and answer the associated questions. Jumping Jacks Gravity Balls Rubber Band Man Swinging Pendulum

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TOD The students will explain “If the same force is applied to two objects of different mass which object will have the greater potential and kinetic energy?”

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Unit E, Chapter 3, Section 1, pE76-77

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