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Simple Machines

Simple Machines. Not always that simple, now are they?. What Are Simple Machines?. 6 Types. 1. Levers. 2. Inclined Planes. 3. Pulleys. 4. Wheel and Axle 5. Wedge 6. Screw. Machines. Machines transfer mechanical energy from one object to another. What Else Do They Do?.

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Simple Machines

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  1. Simple Machines Not always that simple, now are they?

  2. What Are Simple Machines? • 6 Types 1. Levers 2. Inclined Planes 3. Pulleys 4. Wheel and Axle 5. Wedge 6. Screw

  3. Machines • Machines transfer mechanical energy from one object to another What Else Do They Do? • Change the direction of a force • Change the amount of force • Change the distance or speed of force

  4. Mechanical Advantage • How many times the machine multiplies force The larger the mechanical advantage…the easier a machine makes your work

  5. Levers • A simple machine consisting of a bar that pivots at a fixed point Fulcrum: pivot point 3 Classes of Levers video

  6. 1st Class Lever • In a first-class lever the fulcrum is located at some point between the effort and resistance forces. • Common examples of first-class levers include crowbars, scissors, pliers, tin snips and seesaws.

  7. 2nd Class Lever • With a second-class lever, the load is located between the fulcrum and the effort force. • Common examples of second-class levers include nut crackers, wheel barrows, doors, and bottle openers.

  8. 3rd Class Lever • With a third-class lever, the effort force is applied between the fulcrum and the resistance force. • Examples of third-class levers include tweezers, hammers, and shovels

  9. Inclined Planes • Simple machine that is a straight, slanted surface https://www.youtube.com/watch?v=3COvm0TtxWg The longer an inclined plane is compared to its height, the greater the mechanical advantage

  10. Wheel and Axle • Consists of two circular objects of different sizes 1st Circular Object 2nd Circular Object The wheel allows the individual to spin the axle easier

  11. Pulleys • Consists of a grooved wheel that holds a rope or a cable https://www.youtube.com/watch?v=Nj4J7QNeBNk

  12. Compound Machines • Machines that are made of two or more simple machines The more moving parts, the more mechanical advantage

  13. Wedge • The wedge is a modification of the inclined plane. Wedges are used as either separating or holding devices. • A wedge can either be composed of one or two inclined planes. A double wedge can be thought of as two inclined planes joined together with their sloping surfaces outward. • An example of a wedge is an ax

  14. Screw • The screw is also a modified version of the inclined plane. • While this may be somewhat difficult to visualize, it may help to think of the threads of the screw as a type of circular ramp (or inclined plane).

  15. Efficiency In Machine • Machines can be made to be more efficient We do this by REDUCING… Friction Lubricants: substances that are applied to surfaces to reduce friction between them

  16. Research Flip Book 1. Research the following types of simple machines. Make sure you include sub-types if there are any. For example, there are 3 types of levers; first, second and third class. • Lever • Incline plane • Pulley • Wheel and axle • Wedge • Screw 2. List 5 facts about each type of simple machine. 3. Draw a picture of each simple machine. 4. Describe how each simple machine makes our everyday lives easier and how we would struggle without them.

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