How can a simple machine reduce force
- 2. Something that makes work easier to do
- 3. Example: It's easier to lift & carry a rock with a wheelbarrow that to carry it with your hands
- 4. - They are machines with few or no moving parts
- 5. - It is a straight bar that moves on a fixed point "Fulcrum” Examples: Seesaw (1) Lever Load Fulcrum
- 6. Load Fulcrum -Pressing down on a lever, lifts up the load. -Levers change how much force you need to move something.
- 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.
- 12. A Door knob A Wheel barrow
- 13. A shopping cart A Mouse wheel
- 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.
- 18. An Auger is a giant screw
- 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
- 22. 2 wedges Fulcrum “fixed point” 2 levers A pair of scissors is a compound machine that is made of two wedges & two levers
- 23. Pulley Wheel & axle A bicycle is a compound machine that is made of pulleys & wheel & axle.
- 24. Wheel & axle Fulcrum Load A Wheelbarrow is a compound machine that is made of a lever & wheel & axle