Simple Machines

What are simple machines?

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​https://www.youtube.com/watch?v=fvOmaf2GfCY

​Simple Machines Video

• Lever

• ​Wheel and Axle

• ​Inclined Plane

• ​Wedge

• ​Screw

• Pulley​

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6 Simple Machines​

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​https://www.youtube.com/watch?v=5HTaJ2mCGTw

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​Simple Machines: Levcr

Classes of Lever

Class 1 ​has fulcrum located between effort and load. Class 1 lever includes crowbar, scissors, and pliers.

​Class 2 has the load between the effort and load. The effort and resistance move in the same directions. Examples of class 2 levers are wheel barrows, bottle opener, and nutcracker.

​Class 3 has the effort between the load and the fulcrum. Effort and resistance move in the same direction. Fishing rod, tweezer, and tongs are examples of class 3 levers.

A pulley is a grooved wheel that turns around and axle which is held in place by mounting bracket.

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​Pulley

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https://www.youtube.com/watch?v=V9L1eeKjFZU​

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​Simple Machines: Pulley

• Fi​xed Pulley

• Movable Pulley

• ​Compound Pulley

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3 Kinds of Pulley

​has the axle fixed on a surface and therefore does not move. Its fulcrum is at the center of the axle with load and effort on either side. It does not increase the magnitude, speed, or distance of the force. Fixed pulleys are used in flagpoles and clotheslines.

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​Fixed Pulley​

​moves along the rope or wire. The fulcrum is at the edge of the wheel with the load at the middle of the axle and the effort at one end of the rope. It increases the magnitude of the force but decreases its distance. Esamples of movable pulleys are ziplines, weight machines, and elevator cables.

​Movable Pulley​

​is made up of a combination of two or more fixed and movable pulleys. Compound pulleys are used in ships and billboards.

​Compound Pulley​

Inclined Plane

An inclined plane is a plane tilted at an angle, with one end higher than the other.

​Simple Machines: Inclined Plane

​https://www.youtube.com/watch?v=sTOWiDDgTIk