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# Chap 2 Forces Vocabulary

Across
a force that opposes the movement between two surfaces in contact
the speed and direction in which an object is traveling
when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object
a quantity with both size and direction
the force that is perpendicular to the velocity and toward the center of the circle
the rate of change of velocity with time
all objects are attracted to each other with a force that depends on the masses of the objects and the distance between them
a squeezing force applied to an object that can make an object shrink
the force exerted by a material when it is stretched or compressed
a push or a pull
a force exerted by an object that is perpendicular to the surface of the object
a force that one object exerts on another when they are not touching.
Down
the gravitational force exerted on an object
combination of all the forces acting on an object
an object at rest remains at rest, or, if the object is moving, it continues to move in a straight line with constant speed
a force that is exerted only when two objects are touching
the acceleration of an object equals the net force divided by the objectâ€™s mass
a pulling force applied to an object that can make the object stretch
when the net force on an object is not zero
when the net force on an object is zero
an attractive force that exists between all objects that have mass.