1.
a push or pull exerted on an object
2.
sum of all of the forces that are acting on an object
3.
force that opposes the sliding motion between two touching surfaces
4.
attractive force between two objects that depends on the masses of the objects and the distance between them
5.
a region of space in which every point has a physical quantity, such as a force
6.
gravitational force exerted on an object
7.
states that an object moving at a constant velocity keeps moving at that velocity unless an unbalanced force acts on it
8.
tendency of an object to resist any changes in its motion
9.
states that the acceleration of an object is in the same direction as the net force on the object and that the acceleration equals the net force divided by its mass
10.
states that when one object exerts a force on a second object the second object exerts a force on the first object that is equal in strength and in the opposite direction
11.
force that opposes the motion of objects that move through the air
12.
the maximum speed an object will reach when falling through a substance, such as air
13.
describes the fall of an object on which only the force of gravity is acting
14.
a force that is directed toward the center of a curved or circular path
15.
states that energy cannot be created or destroyed
