Across
- 3. the amount of "stuff" in an object
- 6. a force that opposes motion between two surfaces that are in contact
- 7. force combination of all forces
- 8. the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
- 9. a British scientist who described the relationship between motion and force in three laws
Down
- 1. the tendency of an object at rest to remain at rest or, if moving, to continue moving at a constant velocity
- 2. force forces that are not equal on either side of an object
- 4. bag releases quickly to protect a human's head and upper body when in a car crash
- 5. velocity equal speed and direction of an object over equal amounts of time
- 6. the amount of energy exerted on an object