# Newton's Laws

Term Definition
How fast the position of an object changes is its speed
An object's speed in a certain direction if its velocity
A change in a velocity in a certain amount of time is called acceleration
How much an object weighs depends on its mass and the force of gravity
An object's tendency to resist a change in motion is its inertia
An astronaut on the moon has the same mass as she did on Earth, but has less weight
For every action, there is an equal but opposite reaction
Pushes or pulls which completely cancel one another out are called balanced forces
A push or pull that acts on an object is called a(an) force
Pushes or pulls which are not cancelled by other pushes or pulls are called unbalanced forces
Gravity is a force
When object A exerts a force on object B, object B exerts a reaction force on object A
A mass accelerates because a force is acting on it
A baseball and a sheet of paper are dropped at the same time from the same height. If there is no air rresistance the baseball and the paper will land at the same time

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