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# GED Physical Science

### Lesson 5 Motion and Forces

TermDefinition
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