force vocab

1. equal forces acting on an object in opposite directions
4. The upward force that is applied to objects when they exert a force on a surface
5. the force that one surface exerts on another when the two surfaces rub against each other
8. A force exerted toward the center of a curved path
10. A unit of measurement that equals the force required to accelerate 1 kilogram of mass at 1 meter per second, per second
13. the amount of matter in an object
14. The tendency of an object to resist any change in its motion
16. The maximum speed an object will reach when free-falling through a substance, such as air
17. When the net force of an object is zero
18. the force of gravity on an object at the surface of the planet

2. A push or pull on one object by another that is touching it
3. A force that one object can apply to another without physically touching
6. a push or pull exerted on an object
7. the force that pulls objects toward each other
9. forces that produce a nonzero net force, which changes an object's motion
11. the motion of a falling object when the only force acting on it is gravity
12. Friction acting upon an object moving through the air
15. the overall force on an object when all the individual forces acting on it are added together