1. What is a Simple Machine?
Machines are used to reduce the amount of force required to do work.
But you must apply this force over a greater distance.
The amount of WORK
stays the same

2. Inclined Plane
A slope or a ramp.
Any slanted surface used to raise a load from a lower level to a higher level.
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4. Examples: ramps for wheel chairs
a ramp used by a workman to push a heavy load on wheels up into a truck
an escalator
an inclined plane was used to move huge stones to build the Egyptian Pyramids
ramps to load luggage
onto a plane

5. Advantage: Helps to move or raise heavy objects.
Advantage: Lift with LESS FORCE…
Disadvantage: but the distance over which it moves is greater.

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

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

9. 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

10. The amount of WORK stays the same

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

12. Decreases the amount of force needed to move the mass. Disadvantage:
You have to pull the load up
The amount of WORK stays the
same

13. The amount of WORK stays the same

14. What happens to the amount of work?
Which pulley changes the direction of the force?
Which pulley reduces the amount of force?