Friction - a force that slows down or stops movement. Select a laserdisc program on friction. Today you will learn that friction is a type of force that we encounter and use every day. Describe different types of force. Present the concept of friction using the video and supplement with class discussion.
Students complete questions after each demonstration.
Present more complex examples using the video and supplement with class discussion. Allow the students to participate in other examples of friction. Two students wear skates. Have students bring in toy trucks. Use a ramp, a flat surface, a smooth surface, a rough surface, a bumpy surface.