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13 Cards in this Set
- Front
- Back
Potential energy |
energy of position (stored energy) example (ball at rest) |
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Kinetic energy |
energy of motion (energy being used) example (rolling ball) |
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Force |
push or a pull, force is needed to start, stop, or change the direction of the motion of an object; force is measured in Newtons (N) |
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Balanced Forces |
opposite forces that are equal in size, balanced forces do not change the speed or direction of an object |
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Unbalanced forces |
Opposite forces that are not equal in size; unbalanced forces can change the sped and/or direction of an object |
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Speed |
Change in distance over time
distance Speed = ------------------- time |
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Velocity |
speed in a given direction ex: velocity changes when an object speeds up, slows down, or changes direction ex2: 45 mph east |
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acceleration |
a change in velocity ex: a U-turn, turning around |
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Newtons 1st law - Inertia |
An object at rest will remain at rest, and an object in motion will remain in motion, unless the object is acted on by an unbalanced force ex: a rocket resting on the launch pad will remain motionless ex2: seat belt - with a seat belt, when brakes are applied in the car you will remain in the car when the brakes are applied |
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Newtons 2nd law - Force and Acceleration |
the overall force on an object equals the object's mass multiplied by its acceleration Force = mass x acceleration |
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Newtons 3rd law - Action and Reaction |
when one object exerts a force on a second object, the second object exerts a force on the first object that is equal in size but opposite in direction ex: rocket - the engine causes a downward force of exhaust gas resulting in an equal upward force on the rocket |
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At rest |
When an object is not in motion |
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Inertia |
The tendency of a physical object to remain still or continue moving, unless force is applied. |