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Unit 2 Vocabulary

Honors Physical Science (Malone)

TermDefinition
Reference point The starting point you chose to describe the location, or position, of an object.
Position An object's distance and direction from a reference point.
Motion The process of changing position.
Displacement The difference between the initial, or starting, position and the final position.
Speed A measure of the distance an object travels in a given amount of time.
Velocity The speed and the direction of a moving object.
Vector A quantity that has both magnitude and direction.
Acceleration A 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 on one object by another object that is touching it.
Newton's first law of Motion An object at rest will stay at rest, and an object in motion will stay in motion unless a force acts on the object.
Newton's second law of Motion The acceleration of an object is equal to the net force exerted on the object divided by the object's mass.
Newton's third law of Motion When an object applies a force on another object, the second object applies a force of the same strength on the first object but the force is in the opposite direction.
Friction A contact force that resists the sliding motion of two surfaces that are touching.
Free-body diagram A simple model to understand what will happen to an object due to a force.
Net force The combination of all he forces acting on an object.
Force pair The forces two objects apply to each other.
Normal force The force that pushes perpendicular to the object's surface.
Elastic Collision When colliding objects bounce off each other.
Non-contact force A force that one object applies to another without touching it.
Gravity An attractive force that exists between all objects that have mass.
Field A region of space that has a physical quantity (such as a force) at every point.
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