# Simple machines

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simple machines

### Whats a machine?

a device that makes work easier

### What is a load?

The force required to do the job

### What is effort?

The force you use to complete the job

### Machines make a task easier in 3 ways, list them.

size, speed, direction

### What is a lever?

A simple machine consisting of a rigid rod that pivots about a point

### What is a Fulcrum?

The point about which a lever pivots

### What is the definition for a ramp?

Use a smaller force over a larger distance to lift objects

### What is a wedge?

a double inclined plane

pins, nails

### What are zips?

two sets of interlocking teeth

The middle

The outside

### What is a pulley?

A wheel with a grove where a rope can move

### What are gears?

Wheels with teeth

Speed and force

### What are the two ways that gears can work?

They either mesh together or are joined by a chain

### What is a first class lever?

Fulcrum in the middle

### What is a second class lever?

Load in the middle

### What is a third class lever?

effort in the middle

first class

third class

second class

### What is a screw?

A spiral inclined plane

### To calculate the mechanical advantage you need to...

divide the height of the ramp by the length of the ramp

### To calculate the effort required you need to...

Divide the total force by the mechanical advantage

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