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## PowerPoint Slideshow about ' Simple Machines' - fritzi

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### Simple Machines

Make work easier!

What are Simple machines?

- A simple machineis an unpowered mechanical device
- Thereare six basic types of simple machines:
- inclined plane
- wedge
- screw
- lever
- wheel and axle
- pulley

Inclined plane How they make work easier:

- Description:
- a flat, slanted surface

- Increases the distance (small force over long distance)
- Longer the incline plane, the greater mechanical advantage (easier it is to push or pull)

Wedge How it makes work easier:

- Description:
- thick at one end and thin at the other end (2 incline planes put together)
- Splits things apart

- Increases the distance (small force over long distance)
- Longer and thinner the wedge, the greater the mechanical advantage (the easier it is to split things)

Screws How it makes work easier:

- Description:
- an inclined plane wrapped around a center, forming a spiral.

- Increases the distance (small force over long distance)
- Closer together the threads (spiral) the greater the mechanical advantage (the easier it is to pull together)

Wheels and axles

- Description:
- Two circular objects that are connected together and rotate on an axis.
- The large object is called the wheel.
- The small object (stick) is called the axle.

- How it makes work easier:
- Increases your force
- Bigger the wheel, the greater the mechanical advantage (the easier it is to turn)

wheel

Axle

Pulleys

- Description:
- a rope that is wrapped around a grooved wheel.

- How it makes work easier:
- changes the direction
- Increases force
- The more ropes a pulley has, the greater the mechanical advantage (the easier it is to lift things up)

Levers

- Description:
- a rigid bar that rotates on a fixed point called the fulcrum
- Different Classes:
- 1stclass: fulcrum is in middle
- 2nd class: resistance (output) in middle
- 3rdclass: effort (input) in middle

- How it makes work easier:
- 1st: changes directions
- 2nd: increases the distance
- 3rd: increases force

123

FRE

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