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chapter 1+2


pulling force applied to an object that can make an object stretch.


the tendency of an object to resist a change in it's motion.

law of universal gravitation

all objects are attracted to each other and the force of attraction depends upon their masses and distance between them. (ex:planets)

net force

the combination of all the forces acting on an object.


a contact force that opposes the movement between two surfaces in contact.


a quantity with both size and direction.


unit of mass used in Newton's second law of motion.


unit for force-magnitude of a force.

non-content force

a force one object exerts on another when they are not touching.

contact force

exerted only when touching.

balanced forces

forces that combine to make net force of zero.

unbalanced forces

forced that don't combine to a net force of zero.

compression force

a squeezing force applied to an object that can make an object shrink.

normal force

a force exerted by an object that is perpendicular to the surface of the object.

static friction

the force between two surfaces in contact that keeps them from sliding when a force is applied.

elastic force

force exerted by a material when it is stretched or compressed.

centripetal force

circular motion perpendicular to the center of the circle.

Newton's first law of motion

If the net force of an object is zero, an object at rest remains at rest, or if the object is moving it continues to move in a straight line with constant speed.

Newton's second law of motion

the acceleration of an object equals the net force divided by the object's mass.

Newton's third law of motion

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.

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