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8th Unit 4 set A
Force and Motion Key Terms
| Term | Definition |
|---|---|
| Acceleration | the change in velocity of an object over a period of time. |
| Air Resistance | friction of an object through the air. |
| Speed | the rate at which an object covers a distance. |
| Velocity | the rate at which an object covers a distance plus the direction of the object. |
| Equilibrium | a state of rest or balance due to the equal action of opposing forces. |
| Force | an environmental influence on an object’s motion, direction or state. |
| Net force | the sum of all forces acting upon an object. |
| Gravity | a force of attraction directly proportional to an object’s mass. |
| Inertia | the natural tendency of an object to remain at rest or in motion. |
| Momentum | the product of mass and velocity. |
| Normal force | a force acting in opposite direction from another force. |