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# Science Vocab Ch. 2

### Motion, Forces, and Newton's Laws; Lessons 1 - 3

TermDefinition
Motion ... is the process of changing position.
Reference Point The starting point you use to describe the motion or the position of an object is called the ...
Distance ... is the total length of your path.
Speed ... is the distance an object moves divided by the time it took to move that distance.
Velocity ... is the speed and direction of an object's motion.
Acceleration ... is the measure of the change in velocity during a period of time.
Force A push or pull on an object is a ...
Contact Force A ... is apush or a pull applied by one object to another object that is touching it.
Noncontact Force A force that pushes or pulls a n object without touching it is a ...
Friction ... is a contact force that resists the sliding motion between two objects that are touching.
Gravity ... is a noncontact attractive force that exists between all objects that have mass.
Balanced Forces When the net force of an object is 0 N, the forces acting on it are ...
Unbalanced Forces When the net force acting on an object is not 0, the forces acting on the object are ...
Inertia The tendency of an object to resist a change in motion is called ...
Newton's First Law of Motion ... states that if the net force acting on an object is zero, the motion of the object does not change.
Newton's Second Law of Motion ... states that the acceleration of an object is equal to the net force applied to the object divided by the object's mass.
Newton's Third Law of Motion ... says that when one object exerts a force on a second object, the second object exerts a force of the same size, but in the opposite direction, on the first object.
Force Pair When two objects exert forces on each other, the two forces are a ...
Created by: stemljos4017