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Forces

Terms in this set (18)

force
a push or pull on an object
contact force
a push or pull on one object by another that is touching it
noncontact force
a push or pull on an object without direct touch
gravity
an attractive force between all objects that have mass
mass
the amount of matter in an object
weight
the force of gravity on an object
friction
a force that resists the motion between two surfaces in contact
net force
the combination of all forces acting on an object
balanced forces
forces acting on an object that combine and form a net force of zero
unbalanced forces
forces that produce a nonzero net force, which changes an object's motion
inertia
the tendency of an object to resist a change in motion
Newton's First Law
if the net force on an object is zero, the motion of the object does not change
circular motion
any motion in which an object is moving along a curved path
centripetal force
a force that acts perpendicular to the direction of motion, toward the center of the curve, in a circular motion
Newton's Second Law
the acceleration of an object is equal to the net force acting on it divided by the object's mass
momentum
a measure of how hard it is to stop a moving object
the law of conservation of momentum
the total momentum of a group of objects stays the same unless outside forces act on the objects
Newton's Third Law
whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
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