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GED Physical Science
Lesson 5 Motion and Forces
| Term | Definition |
|---|---|
| speed | the rate at which an object moves |
| velocity | an object's speed in a particular direction |
| acceleration | the rate at which velocity changes |
| force | anything that tends to change the state of rest or motion of an object (pushing/pulling/gravity/friction, etc) |
| laws of motion | three laws by which the planets and all other objects move when acted upon by a force (set down by Sir Isaac Newton, an English physicist and mathematician) |
| law of inertia | Newton's first law of motion states that an object at rest will stay at rest until a force acts upon it, and an object in motion will stay in motion at a constant speed in a straight line until a force acts upon it |
| momentum | related to the amount of energy that a moving object has, and it depends on the mass of the object and its velocity (all forces exist in pairs, and all forces are interactions between objects) |
| law of motion (or acceleration) | Newton's second law states that the acceleration of an object depends on its mass and the force acting upon it; the greater the force, the greater the acceleration; the more massive the object, the more force it takes to accelerate it |
| Newton's 3rd law | states that for every action, there is an equal and opposite reaction; this was used to derive the law of conservation of momentum |
Created by:
jpiittmann
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