# Unit Two:Energy, Work, Simple Machines

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### Potential Energy

Energy that is stored

Energy of motion

### Mass and Velocity

Kinetic energy depends on two variables..

### Thermal Energy

Energy due to friction, also refred to as heat energy. example: a toaster.

### Joules

The unit used for any kind of energy

Unit for mass

### m/s

Unit for velocity

### Chemical

This type of potential energy is energy stored in chemical bonds. Plants use the suns energy to create this type of energy

### Elastic

Energy stored by things that stretch or compress is called potential energy

### Electrical Energy

Energy used to run electronics

### Mechanical Energy

the total amount of potential and kinetic energy in a system

### conservation of energy

the law of ...... states that although energy can change forms it cannot be created nor destroyed

### height

Gravitational potential energy depends on two variables mass and (blank)

### Nuclear Fusion

When two atoms combine and energy is released, occurs in the sun

### Nuclear Fission

When two atoms separate and energy is released.

### efficiency

A measure of how much input work is turned into useful output work done by the machine.

### Lever

A bar free to move about a fixed point called a fulcrum

### Wedge

An incline plane with one or two sloping sides

### Pulley

Grooved wheel with a rope running along the groove

### Wheel and Axle

Two wheels of different sizes that rotate together

### Incline Plane

Sloping surface used to raise objects

### Screw

Incline plane wrapped around a cylindrical post

### Work

Force x distance, or equal to the change in energy

### Power

The rate of doing work, Work/time

### Machine

A device that makes doing work easier

### Effort Force

The force you exert on a machine is called the..

### Resistance Force

The force the machine exerts on an object

### Electrical

(Blank) energy refers to the flow of electrons

### Sound

This form of kinetic energy travels in vibrations

(blank) energy includes visible light, radio waves, and even gamma rays.

### Coal

This is the most used source of energy to generate our electricity.

### Natural Gas

this non renewable source of energy can be burned to generate heat for our homes or to generate electricity

### Wind

This renewable source of energy uses a giant turbine to catch the kinetic energy of the air

### Solar

this renewable source of energy uses solar panals to capture the energy from the sun.

### Hydroelectric

Passing water through a dam to spin electric generators takes place in this renewable source of energy.

### greenhouse

using fossil fuels to generate our electricity produces (blank) gasses in our atmosphere.

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