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. (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
- 8. (3) Wheel & Axle - It is a kind of lever that uses a wheel that moves around an axle. Examples: A Ferris wheel Wheel Axle
- 9. A Door knob A Wheel barrow
- 10. A shopping cart A Mouse wheel
- 11. 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
- 12. - 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
- 13. An Auger is a giant screw
- 14. 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
- 15. They are made of two or more simple machines together. Compound machines
- 16. 2 wedges Fulcrum “fixed point” 2 levers A pair of scissors is a compound machine that is made of two wedges & two levers
- 17. Pulley Wheel & axle A bicycle is a compound machine that is made of pulleys & wheel & axle.
- 18. Wheel & axle Fulcrum Load A Wheelbarrow is a compound machine that is made of a lever & wheel & axle