Students begin by defining motion in relation to a reference point. They infer the relationships among force, speed, and mass. Specifically, they use the effect of gravity to show how force can cause motion and how it relates to mass.

Student Resources

• 1.1 Vocabulary
• 1.2 Staying Still
• 1.3 Stay Egg-stra Still
• 1.4 Car Race
• 1.5 Section 1 Assessment

Learn by Reading

For additional content-area reading, check out the Houghton Mifflin Science eBook: Grade 2, Unit F, pages 8–11 and 14–15.