Physics Terms
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16 Terms
Speed
How fast something moves (distance ÷ time)
Velocity
Speed in a specific direction
Acceleration
How quickly velocity changes (speeding up
Momentum
How much motion an object has (depends on mass and velocity)
Force
A push or pull on an object
Net Force
The total of all forces acting on an object
Inertia
An object’s tendency to resist changes in motion
Friction
A force that slows things down when surfaces rub together
Gravity
A force that pulls objects toward Earth
Formula for Speed
Speed = distance ÷ time
Formula for Acceleration
Acceleration = change in velocity ÷ time
Difference between Speed and Velocity
Speed is how fast; velocity is how fast AND in what direction
How to calculate Net Force
Add all forces together (include direction: opposite directions subtract)
Newton’s 1st Law
Objects stay at rest or in motion unless acted on by a force
Newton’s 2nd Law
Force = mass × acceleration
Newton’s 3rd Law
Every action has an equal and opposite reaction