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# P5 Simple Machines

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covers the topic of Simple Machines at a Primary 5 level

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### P5 Simple Machines

1. 1. Simple Machines Done by Group 7 Load
2. 2. Levers <ul><li>Are simple machines that turn around a fulcrum (a fixed point).eg. broom,can opener and nutcracker. </li></ul>Less Effort Effort Load Effort further from fulcrum Fulcrum More Effort Effort Load Effort nearer to fulcrum Fulcrum
3. 3. Wheel and Axle <ul><li>Made up of a large wheel connected to an axle (narrow rod). </li></ul><ul><li>It reduces the effort needed to move or overcome a load. </li></ul><ul><li>Eg. key, steering wheel, water faucet and pencil sharpener </li></ul>Wheel Axle
4. 4. Inclined Planes <ul><li>Pushing a load on an inclined plane takes less effort than lifting it vertically up.eg. ramp, stairs,slides and ladders. </li></ul>Less Effort Load Using an inclined plane Effort More Effort Effort Load Lifting it vertically up
5. 5. Gears <ul><li>Wheels with teeth that can interlock each other. </li></ul><ul><li>They change the speed at which the object moves </li></ul><ul><li>They change the direction of rotation or applied force. </li></ul><ul><li>Eg, watches and bicycles. </li></ul>
6. 6. Pulleys <ul><li>It is a wheel with a groove where a rope or string can go over.eg.window blinds and cranes. </li></ul>It does not change the direction of the applied force. It does not reduce the effort needed to raise the load Negative Point It reduces the effort needed to raise the load by half. It changes the direction of the applied force. Positive Point Single Movable Pulley Single Fixed Pulley
7. 7. Comparison with Pulleys Effort equal to or slightly more than load Load Using a single fixed pulley Effort Effort half of load Load Using a single movable pulley Effort
8. 8. Thank You For Your Attention Group 7=)