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13 Cards in this Set

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friction
A force that opposes the motion of one object moving past another.
force
A pull or push that acts on an object.
Acceleration.
A change in velocity.
Speed
How fast an object is changing its position with time at any moment.
Inertia
The tendency of an object to resist a change in its state of motion.
Velocity
The rate at which friction slows the speed of an object.
Gravity
An attraction between the mass of Earth and the mass of the object.
Unbalanced force
A force either partially cancelled out or not cancelled out at all by other forces.
Accelerate
The force of gravity between two objects increases when their masses do this.
Balanced
When the forces on an object cancel each other out.
Weight
The force of gravity on any object is called the object's ____.
Air resistance.
The force that prevents different objects from falling at the same rate.
Lever
A simple machine that has a rigid bar and fulcrum.