Friction and Inertia

Study friction and inertia from the MatchCard Science Force and Motion Unit Study.

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Friction Worksheet

Force & Motion Unit Study

Friction And Inertia MatchCard

Objective: Demonstrate the effects of friction and inertia.

MatchCard: Download below.

This lesson includes the definitions and common examples of inertia and friction on the MatchCard information pieces.

Projects: Skate, slide, and scrape your way to understanding friction. Ride in a car or wagon to understand both effects of inertia. Pull an old card trick on inertia.

Download and Use the Friction and Inertia MatchCard

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This is MatchCard #3 & 4 of the Force and Motion Unit Study. You can find more information on MatchCard Science below.

What Is Friction?

Friction is resistance to a moving object.

Friction is caused by one surface touching another. Ask the student if it would be easier to roller skate on a smooth roller skating rink, or a gravel road. Why?

Here is a simple hands-on demonstration of friction:
Here are some other ways to experience friction:

More Examples of Friction

Rubbing your hands together to produce warmth, scraping the windshield to remove frost, and applying brakes to slow down a car or bike are other common examples.

Brainstorm a list of other examples of friction. Encourage students to identify examples of friction in daily life over the weeks they are studying Force and Motion.

What Is Inertia?

There are two parts to the definition of inertia:

1. The tendency of a moving object to continue moving at the same speed and direction

Discuss what happens when you are riding in a car and the brakes are applied suddenly. Act out the motion of lurching forward.

Ask them why they think that happens.

If you have a small wagon or toy on wheels demonstrate that effect. Put a stuffed animal in the wagon, push the wagon to get it moving, and then use your foot to stop the wagon suddenly. The stuffed animal should fly forward.

Inertia caused the animal to go forward. The wagon stopped, but the toy did not.

2. The tendency of an unmoving object to remain stationary

Here's a popular demonstration of inertia: What happened? Inertia caused the coin to stay in place.


"Friction" and "inertia" are scientific concepts described above. But sometimes people use these terms to describe in human events.

Have you ever heard of "friction" when there is a disagreement? How does that compare to friction between objects?

Sometimes when someone is not motivated, they will call that "inertia." Why?

MatchCard Science

How To Use MatchCards


MatchCards make science concepts and corresponding vocabulary interactive. As students move the information pieces on the MatchCards they review the material they have already learned.

Download the FREE MatchCard Science Instructor's Guide and see how MatchCards can make building their science knowledge base fun.

Force & Motion Unit Study

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From six simple machines to Newton's Laws, our Force & Motion Unit Study from MatchCard Science helps kids get their hands into science and simple physics..

It will take four to six weeks to complete the seven objectives in this Unit Study.

Download the entire Force And Motion Unit Study.

12 Science Unit Studies

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Chemistry is only one of twelve complete unit studies for kids in 3rd to 8th grade.

Comprehensive objectives, hands-on projects, suggested science fair experiments, and the fun game-like MatchCards keep them interested in learning science. See all twelve MatchCard Science Unit Studies.

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