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Chapter 2
The Laws of Motion
Question | Answer |
---|---|
force | a push or pull on an object |
contact force | is a push or pull on one object by another that is touching it |
noncontact force | a force that one object can apply to another object without touching it |
gravity | is an attractive force that exists between all objects that have mass |
mass | is the amount of matter in an object |
weight | is the gravitational force exerted on an object |
friction | is a force that resists the motion of two surfaces that are touching |
net force | the combination of all the forces acting on an object |
balanced forces | forces acting on an object that combine and form a net force of zero |
unbalanced forces | forces acting on an object that combine and form a net force that is not zero |
Newton's first law of motion | if the net force on an object is zero, the motion of the object does not change |
inertia | the tendency of an object to resist a change in its motion |
Newton's second law of motion | the acceleration of an object is equal to the net force acting on an object divided by the object's mass |
circular motion | is any motion in which an object is moving along a curved path |
centripetal force | in circular motion, a force that acts perpendicular to the direction of motion, toward the center of a curve |
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 of the first object |
force pair | the forces two objects apply to each other |
momentum | a measure of how hard it is to stop a moving object |
law of conservation of momentum | the total momentum of a group of objects stays the same unless outside forces act on the objects |