What is a simple machine? Machines are used to make the work easier or reduce the amount of force required to do work. The amount of WORK stays the same.

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Presentation transcript:

What is a simple machine? Machines are used to make the work easier or reduce the amount of force required to do work. The amount of WORK stays the same

Pulleys A simple machine. A wheel with a groove in it. A rope/cable goes into the groove.

Change direction of force Change amount of force The amount of WORK stays the same Pulleys Can:

Fixed Pulley Stays attached. Does NOT change the amount of force Only changes the direction of force. Easier to pull down than to pull up. The amount of WORK stays the same

The amount of WORK stays the same

Movable Pulley The mass is attached to the pulley. The pulley moves on the rope.

Advantage: Cuts the amount of force needed to move the mass. Disadvantage: You have to pull or push the pulley up or down a longer distance The amount of WORK stays the same

The amount of WORK stays the same

What happens to the amount of work? Which one changes the direction of the force? Which one reduces the amount of force? A B

The inclined plane The word "inclined" means "at an angle". The word "plane" means "a flat surface". An inclined plane is a slope or a ramp. It can be any slanted surface used to raise a load from a lower level to a higher level. phy.cmich.edu wikidave.wikispaces.com

Examples of an inclined plane include a ramp used by a workman to push a heavy load on wheels up into a truck ramps for wheel chairs an escalator an inclined plane was used to move huge stones to build the Egyptian Pyramids ramps to load luggage onto a plane

Advantage of Using an Inclined Plane An inclined plane helps a person to move or raise heavy objects. An inclined plane enables a load to be lifted with LESS FORCE, but the distance over which it moves is greater.