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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

Give two examples of a wedge

pins, nails

What are zips?

two sets of interlocking teeth

What part of a wheel is the axle?

The middle

What part of a wheel is the rim?

The outside

What is a pulley?

A wheel with a grove where a rope can move

What are gears?

Wheels with teeth

What are a gears two multipliers?

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

scissors are what class of lever?

first class

a tennis racquet is what class of lever?

third class

a wheel barrow is what class of lever?

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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