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# Levers, Wheels And Axles, Pulleys

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created for 5th grade science classroom

created for 5th grade science classroom

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### Transcript

• 1. Levers 1 st Class Levers 2 nd Class Levers 3 rd Class Levers
• 2. What is a Lever?
• A lever is a simple machine that is used to lift things.
• It is made up of a bar (called the lever stick) and a support (called the fulcrum).
Lever Stick Fulcrum
• 3. Everyday Examples of Levers
• See-Saw
• Nutcracker
• Wheelbarrow
• Broom
• Can you think of any more?
• 4. Parts of a Lever
• There are different parts and sections of a lever.
• You have the fulcrum and lever stick.
• You also have a force side and a load side.
• The relationship between the position of the load side, fulcrum, and force side determines what class of lever it is.
• 5. Classes of Levers
• There are three different classes of levers.
• 1 st Class: force side-fulcrum-load side
• 2 nd Class: force side-load side-fulcrum
• 3 rd class: load side-force side-fulcrum
• 6. 1 st Class Lever
• Structure of the 1 st Class Lever:
• The see-saw is an example of a first class lever.
• The force needed to lift the load decreases when the fulcrum gets closer to the load side.
• 7. 2 nd Class Lever
• Structure of a 2 nd Class Lever
• The wheelbarrow and the nutcracker are examples of a 2 nd class lever.
• Again, The force needed to lift the load decreases when the fulcrum gets closer to the load side.
• 8. 3 rd Class Lever
• Structure of a third class lever
• The broom is an example of a 3 rd class lever.
• The load is the dirt or end of the broom, the force is your bottom arm, and the fulcrum is your top hand.
• 9. What type of lever am I (1,2,or3)? 1 st Class 1 st Class 2 nd Class 2 nd Class 3 rd Class 3 rd Class
• 10. Wheels and Axles Wheel and Axle
• 11. What is a Wheel & Axle?
• A wheel and axle is a simple machine consisting of a wheel that revolves (turns) around a post (axle).
• This simple machine makes it easier for us to move things from one place to another.
• The further the force is away from the axle, the easier it is to turn the wheel. This means that it is easier to turn a big wheel than a small wheel.
• 12. Pictures of Wheels and Axles
• 13. Common Examples
• 14. Pulleys Fixed Pulley Movable Pulley Block and Tackle
• 15. What is a Pulley?
• Pulleys are a kind of simple machine that consists of a rope that fits onto a wheel and changes the direction of a force.
• There are three kinds of pulleys.
• Fixed Pulley
• Movable Pulley
• Block and Tackle (combo of fixed and movable)
• 16. Fixed Pulley
• Wheel attached to surface
• Changes the direction of the applied force
• NO mechanical advantage – same amount of force is required
• 17. Movable Pulley
• Pulley moves along the rope