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McC 8 ESL Physics
Force, Motion, Newton's Laws
Term | Definition |
---|---|
Acceleration | Change in velocity divided by the amount of time needed for that change to take place; occurs when an object speeds up, slows down or changes directions |
Balanced Force | Describes forces that are equal but opposite in directions; cancel each other out and no change in motion occurs |
Displacement | Measures the distance and direction from a starting point to an ending point |
Distance | The entire path an object travels |
Force | A push or a pull; has a size and direction |
Friction | Any force that resists motion |
Gravity | Force of attraction between all objects in the universe |
Inertia | An object’s tendency to remain at rest or keep moving with constant velocity |
Speed | Distance traveled divided by the time needed to travel that distance; Speed = Distance/Time |
Unbalanced Forces | Unequal forces acting on an object – results in a change in the object’s motion in the direction of the larger force |
Velocity | Speed and direction of a moving body |
Newton's 1st Law | An object will remain at rest or move in a straight line with constant speed unless acted upon by an unbalanced force |
Newton's 2nd Law | An object acted upon by an unbalanced force will accelerate in the direction of the force; Force = Mass X Acceleration |
Newton's 3rd Law | Forces always act in equal but opposite pairs; Action and Reaction Pair example: bat touches ball and ball touches bat |