Grade 5 · Science · Lesson 15

Forces, Motion & Friction

A force is a push or a pull. Forces start motion, stop motion, speed objects up, slow them down, or change their direction. Every time something moves, a force is at work — even when you cannot see what is causing it.

What this lesson teaches

1Describe how pushes and pulls change the motion of objects
2Explain how friction slows objects down and creates heat
3Identify everyday examples of pushes, pulls, and friction
4Predict how a force will change an object's speed or direction

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