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Simple and Compound Machines. What are Simple Machines?. A device that allows work to be performed with less effort A device with few or no moving parts A device that makes work easier by changing force, distance, or by changing the direction of the force. What are Compound Machines?.

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what are simple machines
What are Simple Machines?
  • A device that allows work to be performed with less effort
  • A device with few or no moving parts
  • A device that makes work easier by changing force, distance, or by changing the direction of the force

What are Compound Machines?

Two or more simple machines working together to make the work easier

lever
Lever

A rigid bar used to exert a pressure or sustain a weight by pivoting on its fulcrum

parts of a lever
Parts of a Lever

If the fulcrumis located at the midpoint of the lever armand the effortis equal to the load, then the lever will be perfectly balanced.

Lever Arm

Effort

Load

Fulcrum

types of levers
Types of Levers

You can identify the different types of levers by the middle component.

Can you identify each type of lever on the next slide?

wheel axle
Wheel & Axle

A wheel is a lever arm that is fixed to a shaft, which is called an axle.

The wheel and axlemove together as a simple lever to lift or to move an item by rolling.

pulleys
Pulleys

A grooved wheel around which a rope, belt, or chain passes

Used to change the direction or magnitude of a force

inclined plane
Inclined Plane

Flat surface set at an angle or incline

Most common inclined plane is a ramp

Able to lift objects by pushing or pulling the load

wedge
Wedge

Functions as a moving inclined plane

Tapers to a thin edge and is used for splitting or for tightening by being driven into something

examples of wedges
Examples of Wedges

Almost all cutting tools make use of the wedge.

screw
Screw

An inclined plane wrapped around a cylinder, forming the path and pitch

Pitch is the distance between two threads

A screw is used as a threaded fastener. It changes rotary motion to linear force.

what kind of simple machine is this
What Kind of Simple Machine Is This?

Wedge

Pulley

Wheel and Axle

Screw

Inclined Plane

Lever

compound machines
Compound Machines
  • Compound machines consist of two or more simple machines put together.
  • Most devices are compound machines.
  • They can do more difficult jobs because their mechanical advantage is greater.

What two simple machines are in scissors?

First Class Lever and Wedge

image resources
Image Resources

Microsoft, Inc. (2009). Clip Art. Retrieved January 22, 2009, from http://office.microsoft.com/en-us/clipart/default.aspx