Dynamics

3. A contact force that works against the motion of objects moving past each other; impacted by surfaces and angles of ramps
5. the unit of force
8. A push or pull on an object; causes change in motion of an object
9. forces acting on an object that combine and form a net force of zero
12. friction that occurs when an object rolls over a surface
15. A force that causes an object to move in a circle
17. a measure of the force of gravity on an object (mass times gravity)
18. the friction that exists between two objects that are attempting to move but are not yet in motion relative to each other
19. the measure of how much matter is in an object

1. the friction that exists when two objects are in motion relative to each other
2. forces that have an effect only on objects that they touch
3. Gravity, Strong Nuclear Force, Weak Nuclear Force, Electromagnetic Force
4. the branch of physics that studies forces and how they can change an object's motion
6. force that acts in a direction perpendicular to the surface where two objects make contact; equal in magnitude and opposite in direction
7. the sum of all forces acting on an object
10. forces exerted at a distance
11. forces acting on an object that combine and form a net force in a particular direction
13. the tendency of matter to resist change in its motion
14. a field force that acts between any two objects; gives objects weight
16. a pulling force that is transmitted through a rope, chain, or similar object