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What is happening

Mechanical advantage We used pulleys Simple machine

SIMPLE MACHINES

What is a machine? Definition? Example?

A complex machine is made up of Simple machines: A non-powered mechanical device that changes the direction or the amount of force. Using a simple machine allows the user to apply less force than would be required to do the same amount of work without the machine Types of simple machines: Inclined plane Wedge, screw Pulley Wheel and axle Lever

Mechanical advantage and work Input force is amplified with a simple machine Work is force exerted over a distance W = F x d Mechanical advantage allows for a diminished force used in exchange for increased distance travelled

Inclined Plane A slope that reduces the force that must be exerted to lift a load or object.

Inclined Plane How does it work? The downwards force is diminished due to the slope. The steeper the slope, the more effort is needed.

Wedge (a type of inclined plane) Two inclined planes stuck back-to-back. It is used to apply a force to an object to split it into two parts.

Screw An inclined plane rolled around an axis

Pulley A wheel fitted with a cord or chain. Simple pulleys can be fixed or mobile

Levers A moving bar that rests on a supporting point called a fulcrum. All levers involve a fulcrum, force and load Depending on how the components are organized, we obtain different classes of levers.

First Class Lever The fulcrum is in the middle

Second Class Lever The load is in-between the force and fulcrum

Third Class Lever The effort is in-between the load and lever

Wheel and Axle Wheel and axle is a wheel that turns around an axle

Wheel and Axle