Simple Machines 1
- 2. What is a Simple Machine? A simple machine has few or no moving parts. Simple machines make work easier
- 3. Wheels and Axles The wheel and axle are a simple machine The axle is a rod that goes through the wheel which allows the wheel to turn Gears are a form of wheels and axles
- 4. Pulleys Pulley are wheels and axles with a groove around the outside A pulley needs a rope, chain or belt around the groove to make it do work
- 5. Inclined Planes An inclined plane is a flat surface that is higher on one end Inclined planes make the work of moving things easier
- 6. Wedges Two inclined planes joined back to back. Wedges are used to split things.
- 7. Screws A screw is an inclined plane wrapped around a shaft or cylinder. The inclined plane allows the screw to move itself when rotated.
- 8. Levers-First Class In a first class lever the fulcrum is in the middle and the load and effort is on either side Think of a see-saw
- 9. Levers-Second Class In a second class lever the fulcrum is at the end, with the load in the middle Think of a wheelbarrow
- 10. Levers-Third Class In a third class lever the fulcrum is again at the end, but the effort is in the middle Think of a pair of tweezers
- 11. Simple Machines Simple Machines can be put together in different ways to make complex machinery
Editor's Notes
- #6: A sloping surface, such as a ramp. An inclined plane can be used to alter the effort and distance involved in doing work, such as lifting loads. The trade-off is that an object must be moved a longer distance than if it was lifted straight up, but less force is needed. You can use this machine to move an object to a lower or higher place. Inclined planes make the work of moving things easier. You would need less energy and force to move objects with an inclined plane.