1. Chapter 10 Vocab Review
8th Grade

2. A push or pull- described by strength and direction in which it acts
force

3. The SI unit used to measure the strength of a force
1Kg * m/s2
Newton (N)

4. The combination of all forces acting on an object.
Net force

5. Result in a net force and cause a change in the object’s motion.
Unbalanced forces

6. Equal forces acting on one object in opposite directs
Balanced forces

7. The force that two surfaces exert on each other when they rub against each other.
Friction

8. The friction that acts on objects that are not moving
Static friction

9. Occurs when two solid surfaces slide over each other.
Sliding friction

10. When an object rolls across a surface.
Rolling friction

11. Occurs when a solid object moves through a fluid.
Fluid Friction

12. A force that pulls objects toward each other.
Gravity

13. The force of gravity on a person or object at the surface of a planet.
weight

14. Happens when the only force acing on a falling object is gravity.
Free fall

15. An upward force exerted on falling objects.
Air resistance

16. The greatest velocity a falling object reaches
Terminal velocity

17. An object that is thrown
Ex. Throwing the football in class
Projectile

18. An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.
Newton’s First Law of Motion

19. The tendency of an object to resist a change in motion.
Ex. When you are running it is hard to stop quickly because your body has inertia and resists a change in motion.
Inertia

20. Acceleration depends on the object’s mass and on the net force acting on the object.
Newton’s Second Law of Motion

21. If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
Newton’s Third Law of Motion

22. A characteristic of a moving object that is related to the mass and the velocity of the object.
Momentum

23. In the absence of outside forces, the total momentum of objects that interact does not change.
Law of conservation of momentum

24. Any force that causes an object to move in a circular path.
Ex. Swinging a bucket of water around your head.
Centripetal force