1. Gravity and Friction Vocabulary
Science 8-Chapter 2
Gravity and Friction
Vocabulary

2. force
a push or pull on an object

3. contact force
a push or pull on an object by another object that is touching it

4. noncontact force
a push or pull on an object by another object without touching it

5. gravity
an attractive force that exists between all objects that have mass

6. mass
the amount of matter in an object

7. law of universal gravitation
all objects are attracted to each other by a gravitational force

8. weight
the gravitational force exerted on an object

9. significant
important, momentous

10. friction
a force that resists the motion of two surfaces that are touching

11. static friction
a force that prevents objects from moving, or keeps them at rest

12. sliding friction
a force that prevents objects from moving, or keeps them at rest

13. fluid friction
friction between a surface and a fluid

14. air resistance
fluid friction between a surface and air

15. static
at rest or having no motion