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13 Cards in this Set

  • Front
  • Back

Potential energy

energy of position (stored energy)


example (ball at rest)

energy of position (stored energy)




example (ball at rest)

Kinetic energy

energy of motion (energy being used)


example (rolling ball)

energy of motion (energy being used)




example (rolling ball)

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)

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)

Balanced Forces

opposite forces that are equal in size, balanced forces do not change the speed or direction of an object

opposite forces that are equal in size, balanced forces do not change the speed or direction of an object

Unbalanced forces

Opposite forces that are not equal in size; unbalanced forces can change the sped and/or direction of an object

Opposite forces that are not equal in size; unbalanced forces can change the sped and/or direction of an object

Speed

Change in distance over time                 
                  distance
Speed = -------------------

                    time
Change in distance over time


distance


Speed = -------------------


time

Velocity

speed in a given direction


ex: velocity changes when an object speeds up, slows down, or changes direction


ex2: 45 mph east

speed in a given direction




ex: velocity changes when an object speeds up, slows down, or changes direction




ex2: 45 mph east

acceleration

a change in velocity


ex: a U-turn, turning around

a change in velocity




ex: a U-turn, turning around

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

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

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

At rest

When an object is not in motion

When an object is not in motion

Inertia

The tendency of a physical object to remain still or continue moving, unless force is applied. 

The tendency of a physical object to remain still or continue moving, unless force is applied.