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Physics Unit
Question | Answer |
---|---|
Isaac Newton | Defined the laws of motion and gravity. Tried to explain motion of the universe. |
Newton's First Law | An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. |
Newton's Second Law | Force = mass x acceleration |
Newton's Third Law | For every action there is an equal and opposite reaction |
Gravity | A force that pulls objects toward each other |
Mass | the amount of matter in an object |
Weight | A measure of the force of gravity on an object |
Normal Force | the perpendicular contact force exerted by a SURFACE on another object |
Friction | A force that opposes motion between two surfaces that are in contact |
Drag/Air Resistance | This force is similar to friction. It opposes motion of objects moving in air or fluids. |
Speed | The distance an object travels per unit of time |
Velocity | the speed of an object in a particular direction |
Terminal Velocity | the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity |
Acceleration | the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change |
Momentum | The product of an object's mass and velocity |