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Motion Unit Vocabulary
learn the definitions to words relating to your school's physics class
11
Physics
02/27/2012

Term
 Acceleration
Definition
 a change in the velocity of an object, or the rate at which this change occurs.
Term
 Average speed
Definition
 total distance divided total time. The speeds taken at anytime between point A and point B can be different.
Term
 Constant speed
Definition
 equal distances are covered in equal amounts of time. The speeds taken at anytime between point A and point B will always be the same.
Term
 Force
Definition
 the push or pull on an object that causes motion or change. Force is measured in Newtons.
Term
 Inertia
Definition
 the tendency of an object to keep doing what it is already doing, whether it is at rest or in motion.
Term
 Motion
Definition
 the change in position or place of an object when compared to a reference object.
Term
 Newton
Definition
 the basic metric unit of force.
Term
 Newton’s first law of motion
Definition
 an object at rest will remain at rest and an object in motion will continue to move in a straight line unless acted upon by an outside force.
Term
 Newton’s second law of motion
Definition
 the force on an object equal its mass times its acceleration.
Term
 Newton’s third law of motion
Definition
 for every action, or force, there is an equal and opposite reaction, or force.
Term
 Reference object
Definition
 a place or object that is assumed to be stationary and by which the movement of other objects is determined. Also called reference point or Frame of Reference.
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