SIMPLE MACHINES

26. D. Pulley

27. A. Wedge

28. C. Inclined Plane

29. D. Wheel and Axle

30. C. Screw

Pulley

A pulley is a grooved wheel that turns around an axle which is held in place by a mounting bracket. A rope or wire moves along the wheel's circumference. It is used to pull up objcets. Like a lever, a pulley has three points interest. The fulcrum, the point of effort at one end of the rope, and the resistance or load to be lifted. There are three kinds of pulleys.

1. Fixed pulley
2. Movable pulley
3. Compound pulley

Wedges

A wedge is an inclined plane or two inclined planes that meet each other to form a sharp edge. Some wedges are rolled up to have a sharp point instead of an edge. Wedges are usually good for cutting. A wedge increases the force and change its direction. The longer or thinner the fan wedge, the greater the force.

Inclined Plane

An inclined plane is a plane tilted at an angle, with one end higher than the other. It makes moving things to a higher place a lot easier.

Wheel And Axle

The wheel and axle is a machine that has a small disk or shaft called an axle that is attached to a wheel. The wheel may be a complete wheel or a crank that turns like a wheel. When the axle turns, the wheel also turns. The center of the axle is thw fūlcrum, the radius of the wheel is the point of effort, and the radius of the axle is the resistance. A wheel and axle can change the direction of the force. It is more effective if there is a greater difference between the wheel and the axle.

Screw

A screw is actually a spiral inclined plane. It is composed of a cylindrical body with a spiral ridge called thread. The threads surround the cylinder from the tip to the head. A screw increases the force but at a longer distance.

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