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8th Grade Physics
Term | Definition |
---|---|
Motion | The change in an object’s position with respect to time. |
Speed | The distance traveled by an object in a given amount of time. |
Balanced Force | The net force on an object is zero and the object’s motion does not change. |
Unbalanced Force | The net force of an object does not equal zero which results in a change in the motion of the object. |
Net Force | The sum of all the forces acting on an object. |
Magnitude | The strength of an object or event. |
Force | A push or a pull. |
Friction | The force between objects that affects how easily they move past each other. |
Gravity | A force that pulls objects together. |
Potential Energy | Energy at rest or stored energy. |
Kinetic Energy | Energy in motion. |
Velocity | Measurement of speed and direction of an object. |
Acceleration | Speed up, slow down, or change direction (The rate of change in an object's speed.) |
Inertia | The tendency of a physical object to remain still or continue moving |
At Rest | The state of an object when it is not in motion |
Newton’s First Law of Motion | An object at rest stays at rest or an object in motion stays in motion until unbalanced forces act upon it. This is often referred to as Newton's law of inertia. |
Newton’s Second Law of Motion | Acceleration of an object depends on the object's mass and the magnitude of the force acting upon it (F = ma). This is often referred to as Newton's law of force and acceleration. |
Newton’s Third Law of Motion | For every action there is an equal and opposite reaction. This is often referred to as Newton's law of action-reaction. |