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# Lesson 2 Chapter 1

### Science still...

TermDefinition
Motion The process of changing positions.
Reference Point The starting point used to describe the motion or the position of an object.
Distance The total length of your path.
Displacement The distance between your initial, or starting, position to your final position.
Speed The distance an object moves divided by the time it took to move that distance.
Velocity The speed and direction of an object's motion.
Acceleration The measure of the change in velocity during a period of time.
Force A push or pull on an object.
Contact Force A push or pull applied by one object to another object that is touching it.
Noncontact Force A force that pushes or pulls an object without touching it.
Friction A contact force that resists the sliding motion between two objects that are touching.
Gravity A noncontact attractive force that exists between all objects that have mass.
Balanced Forces When the net force on an object is 0N, the forces acting on it.
Unbalanced Forces When the net force of an object is not 0N, the forces acting upon the object.
Created by: W.D. Gaster