# Simple and Compound Machines

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Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Simple and Compound Machines

What are Simple Machines?
Simple and Compound Machines Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics What are Simple Machines? A device that allows work to be performed with less effort A device with few or no moving parts A device that makes work easier by changing force, distance, or by changing the direction of the force What are Compound Machines? Two or more simple machines working together to make the work easier

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics The 6 Simple Machines

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Lever A rigid bar used to exert a pressure or sustain a weight by pivoting on its fulcrum

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Parts of a Lever If the fulcrum is located at the midpoint of the lever arm and the effort is equal to the load, then the lever will be perfectly balanced. Lever Arm Effort Load Fulcrum

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Types of Levers You can identify the different types of levers by the middle component. Can you identify each type of lever on the next slide?

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Examples of Levers First Class = See-saw, scissors, fingernail clipper arm Second Class = wheelbarrow, nut cracker Third Class = fingernail clipper clipping mechanism, tweezers

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Wheel & Axle A wheel is a lever arm that is fixed to a shaft, which is called an axle. The wheel and axle move together as a simple lever to lift or to move an item by rolling.

Examples of Wheel & Axles
Simple and Compound Machines Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Examples of Wheel & Axles

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Pulleys A grooved wheel around which a rope, belt, or chain passes Used to change the direction or magnitude of a force

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Examples of Pulleys

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Pulley Systems Fixed Pulley – Does not rise or fall with the load that is being moved Movable Pulley – Rises and falls with the load that is being moved Block and Tackle – Two or more pulleys used in combination

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Inclined Plane Flat surface set at an angle or incline Most common inclined plane is a ramp Able to lift objects by pushing or pulling the load

Examples of Inclined Planes
Simple and Compound Machines Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Examples of Inclined Planes

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Wedge Functions as a moving inclined plane Tapers to a thin edge and is used for splitting or for tightening by being driven into something

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Examples of Wedges Almost all cutting tools make use of the wedge.

Simple and Compound Machines
Screw Simple and Compound Machines Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics An inclined plane wrapped around a cylinder, forming the path and pitch Pitch is the distance between two threads A screw is used as a threaded fastener. It changes rotary motion to linear force.

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Examples of Screws

What Kind of Simple Machine Is This?
Simple and Compound Machines Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics What Kind of Simple Machine Is This? Wedge Pulley Wheel and Axle Screw Inclined Plane Lever

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Compound Machines Compound machines consist of two or more simple machines put together. Most devices are compound machines. They can do more difficult jobs because their mechanical advantage is greater. What two simple machines are in scissors? First Class Lever and Wedge

Name the Simple Machines Present in Each Compound Machine
Simple and Compound Machines Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Name the Simple Machines Present in Each Compound Machine Bicycle – lever (brake handles), wheel and axle (wheels and pedals), screw (seat adjustment) Shovel – lever, wedge Wheel barrow – 2nd class lever, wheel and axle Jack stand – wheel and axle, screw Pencil sharpener – wheel & axle, wedge

Simple and Compound Machines
Gateway To Technology Unit 5 – Lesson 5.3 – Applied Physics Image Resources Microsoft, Inc. (2009). Clip Art. Retrieved January 22, 2009, from