7. What does the lever do?
- It makes it easier to lift loads.
What happens to the force?
- The force becomes less.
- And the direction of force
changes to the opposite.
8. (2) Pulley
- It is a kind of lever that uses a wheel & a
rope to lift an object
Examples:
When you pull down one end of the rope, the
other end rises up
Wheel
Rope
9. What does the pulley do?
- It makes it easier to lift loads.
What happens to the force?
- The force becomes less.
- And the direction of force
changes to the opposite.
10. (3) Wheel & Axle
- It is a kind of lever that uses a wheel that
moves around an axle.
Examples:
A Ferris wheel
Wheel
Axle
11. What does the wheel and
axle do?
- It makes it easier to move loads.
What happens to the force?
- The force becomes less.
14. It is a simple machine with flat & inclined
surface which reduce the force needed to
move an object.
Example:
A Ramp
- It is easier to slide a heavy box on an inclined
Plane than to lift it up.
(4) Inclined plane
15. What does the inclined plane
do?
- It makes it easier to carry loads up.
What happens to the force?
- The force becomes less.
- And the distance becomes more.
16. - It is an inclined plane wrapped onto a spiral.
- "A screw changes a turning force into a
downward force“ as we turn the screw,
it moves down.
Example:
{It is easier to turn a screw than to pound a nail}
(5) A screw
17. What does the screw do?
- It makes it easier to fix loads.
What happens to the force?
- The force becomes less.
- And the direction of force
changes from turning to
downwards.
19. It is a simple machine that splits objects
apart.
"A Wedge changes a downwards force into
sideways force"
Examples:
The Head of an Ax The Knife
(6) A Wedge
20. What does the wedge do?
- It makes it easier to cut loads.
What happens to the force?
- The force becomes less.
- And the direction of force
changes from downwards to
sideways.
21. They are made of two or
more simple machines
together.
Compound machines
