Work, Tools, and Simple Machines

Unit Review Sheet

Facts and Definitions

Lesson 1: Work

• Scientists define work as any time that a force is used to move something.

Lesson 2: The Six Simple Machines

• A machine is a device that does work.
• An inclined plane is a slanted surface used to move objects to different heights.
• A lever is a simple machine made up of a stiff arm that pivots or turns.
• A pulley is a simple machine made up of a rope or chain around a wheel.
• The wheel and axle is a simple machine made of a large wheel attached to a post or axle.
• The wedge is two inclined planes joined back to back.
• The screw is an inclined plane wrapped around a post.

Lesson 3: The Inclined Plane

• The slope of an inclined plane is measured by the distance in the height from one end to the other.
• A constant is a condition that does not change.
• A variable is a condition that does change.

Lesson 4: The Screw and the Wedge

• The screw is an inclined plane wrapped around a shaft.

Lesson 5: Lever, Pulley, and Wheel and Axle

• A lever consists of a plank and fulcrum.
• A pulley is used to lift heavy objects.

Lesson 6: Tools and Machines Make Work Easier

• Tools and machines make work easier.
• Tools and machines help us to solve problems.

Lesson 7: Tools and Machines over Time

• An archaeologist is a scientist who studies people and cultures of the past.
• Artifacts are found objects that were used in the past

Final Project: Presenting - Simple Machines

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