You already knew that force causes motion; now that we have developed the necessary concepts (balanced and unbalanced forces; direction of forces; velocity and acceleration) we can give a much more precise statement of the relationship between force and motion.

Main pages in this section	Estimated time required
Egg Drop	30 minutes
Rolling Race	30 minutes
Science content: The Law of Force and Acceleration	30 minutes
Discussion of the unit on The Law of Force and Acceleration	30 minutes

Materials needed for this section

• Force scale*
• Ramp*
• steel balls of two sizes *
• track section *
• modeling clay *

Supplementary material:
Why study the Law of Force and Acceleration?
More about the Law of Force and Acceleration

Next section:Kinetic energy and potential energy