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Simple Machines
The six simple machines, examples and key ideas.
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- Simple machineQuestionA tool with few or no moving parts that makes work easier
- How many kinds of simple machines are there?QuestionSix
- Name the six simple machinesQuestionLever, wheel and axle, pulley, inclined plane, wedge, screw
- LeverQuestionA bar that rotates around a point called a fulcrum
- FulcrumQuestionThe pivot point of a lever
- EffortQuestionThe force you apply to a machine
- Load (resistance)QuestionThe weight a machine moves
- First-class leverQuestionFulcrum is between the effort and the load
- Second-class leverQuestionLoad is between the fulcrum and the effort
- Third-class leverQuestionEffort is between the fulcrum and the load
- Example of a first-class leverQuestionA seesaw or a crowbar
- Example of a second-class leverQuestionA wheelbarrow or a nutcracker
- Example of a third-class leverQuestionA fishing rod, a broom or tweezers
- Inclined planeQuestionA flat sloped surface used to raise or lower loads
- Example of an inclined planeQuestionA ramp or a slide
- WedgeQuestionTwo inclined planes put together to split or cut things
- Example of a wedgeQuestionAn axe, knife or doorstop
- ScrewQuestionAn inclined plane wrapped around a cylinder
- Example of a screwQuestionA jar lid, a bolt or a light bulb base
- Wheel and axleQuestionA wheel joined to a rod so they turn together
- Example of a wheel and axleQuestionA doorknob, a steering wheel or a bicycle wheel
- PulleyQuestionA wheel with a rope or chain that changes the direction of a pull
- Example of a pulleyQuestionA flagpole rope, a crane or a window blind
- Fixed pulleyQuestionA pulley attached in place; changes the direction of force
- Movable pulleyQuestionA pulley that moves with the load; reduces the force needed
- Block and tackleQuestionA system of pulleys that gives a large mechanical advantage
- Mechanical advantageQuestionHow many times a machine multiplies your effort
- Do machines reduce the work done?QuestionNo; they make work easier by changing force or direction
- What do you give up when you use less force?QuestionYou move through a longer distance
- Compound machineQuestionTwo or more simple machines working together
- Example of a compound machineQuestionScissors, a bicycle or a can opener
- Scissors are made ofQuestionLevers and wedges
- A longer ramp makes itQuestionEasier to push things up, but you push farther
- WorkQuestionForce times distance
- WheelbarrowQuestionA second-class lever with a wheel and axle
- PliersQuestionTwo levers joined together
- Bottle openerQuestionA second-class lever
- StairsQuestionA set of inclined planes
- Spiral staircaseQuestionA kind of screw shape
- ZipperQuestionA group of tiny wedges
- ChiselQuestionA wedge
- Faucet handleQuestionA wheel and axle
- GearsQuestionToothed wheels that turn each other
- Ax splitting woodQuestionUses a wedge to push wood apart
- Drill bitQuestionA screw
- Teeter-totterQuestionA first-class lever
- Baseball batQuestionA third-class lever
- Hammer pulling a nailQuestionA first-class lever
- Why is a longer lever arm helpful?QuestionLess effort force is needed to lift the load
- Archimedes' famous line about leversQuestionGive me a place to stand and I will move the Earth
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