# 7th Science CH test Energy and Resources

### 24 terms by rbalzer

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### energy

when a bat bits a baseball, this is transferred from the bat to the ball

### kinetic energy

as a baseball flies through the air after being hit, this is the type of energy it has

### KE = mv/2

This is the formula for finding kinetic energy

### friction

a force that opposes motion between two surfaces that are touching

### this happens when electrical energy is changed to thermal energy

energy converstion takes place

chemical energy

### growing an apple tree

is a conversion from light energy to chemical energy

### gravitational potential energy

the energy that is given to an object that is lifted

### energy

the ability to do work

### light energy

the energy that is produced by vibrations of electrically charged particles

### kinetic energy

the energy of motion

### potential energy

the energy an object has because of its position

### sound energy

the energy caused by an objects vibrations of electrically charged particles

### mechanical energy

the total energy of motion and position of an object

### thermal energy

all of the kinetic energy due to the random motion of the particles that make up an object

### electrical energy

the energy of moving electrons

can measure the energy from the sun

### when is the potential energy the greatest in a roller coaster

at the top of the first hill

### after an energy conversion, you end up with the same total amount of energy as the original amount of potential energy. This law explains this rule

law of conservation

### thermal energy

the original energy is converted any time an energy conversion takes place

### energy effciency

is found when you compare the amount of energy before a conversion with the amount of energy present after a conversion

### fossil fuels are considered

nonrenewable resources

### electric generator

this converts kinetic enrgy into electrical energ

### wind energy

this is a renewable resource.

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