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# Ch. 3 - Glencoe

### Vocab

TermDefinition
field a region of space that has a physical quantity at every point
force a push or a pull
friction force that opposes the sliding motion of two surfaces that are touching each other
gravity an attractive force between any two objects that depends on the masses of the objects and the distance between them
net force the sum of all of the forces acting on an object
weight the gravitational force exerted on an object
inertia the tendency of an object to resist any change in motion
Newton's 1st Law of motion an object moves at a constant velocity unless an unbalanced force acts on it
Newton's 2nd Law of motion an object's acceleration is in the same direction as the net force on the object and is equal to the net force exerted on it divided by its mass
Newton's 3rd Law of motion when one object exerts a force on a second object, the second objects exerts a force on the first that is equal in strength and opposite in direction
air resistance a friction-like force that opposes the motion of objects that move through the air
centripetal force a force exerted toward the center of a curved path
free fall the motion of an object who's only force is gravity. Falling without air resistance.
law of conservation of momentum if no external forces act on a group of objects, their total momentum does not change
terminal velocity the maximum speed an object will reach when falling through a substance, such as air
Created by: haasem