Introduction


Hands Friction Test

Rub your hands together quickly. What do you feel? You should feel your hands becoming slightly warmer. This heat is due to the force of friction acting between your two hands as you move them.

two hands rubbing together

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Friction

Friction is a force that resists the motion of objects sliding against each other. It's a very common force that you interact with on a daily basis. Car tires on a road and a book sliding on a desk are both examples of friction.

Tires on cars and planes can even heat up due to friction. Sometimes smoke can even be see in car races.

car race with tire smoke coming from the tires

We briefly talked about friction in the last lesson. In this lesson you will learn more about friction and its effect on the motion of objects.

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Lesson Objectives

Following successful completion of this lesson, students will be able to...

  • Define friction
  • Investigate the effects of friction on the motion of an object

Enduring Understandings

  • A force is a push or pull upon an object, and motion is the result of unbalanced forces acting on an object.

The above objectives correspond with the Alabama Course of Study: Physical Science standards: 8.

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