Chapter 3: Motion, Acceleration, and Forces 

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20 Terms

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Vector

: A quantity that is specified by both a size and a direction.

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Acceleration

: the change in velocity divided by the time for the change to occur.

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Force

: a push or pull that one object exerts on another.

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Terminal Velocity

The is the highest velocity the falling object will reach.

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Air Resistance

: opposes the motion of objects that move through the air.

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Friction

: the force that opposes the sliding motion of two surfaces that are in contact.

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Displacement

: the distance and direction of an objects final position from its initial position.

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Reference Frame

a group of objects that are not moving relative to each other

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Displacement

the distance and direction of an objects final position from its initial position

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Speed

the distance an object travels per unit of time

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Instantaneous Speed

the speed at a single instant of time

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Average Speed

the total distance traveled divided by the total travel time

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Velocity

the speed of the object and its direction of motion

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Acceleration

the change in velocity divided by the time for the change to occur

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Net Force

When two or more forces act on an object at the same time

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Balanced Forces

Forces on an object that are equal in size and opposite in direction

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Unbalanced Forces

When forces combine to produce a net force that is not zero, the forces acting on the object

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Static Friction

the frictional force that prevents two surfaces in contact from sliding past each other

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Sliding Friction

the frictional force that prevents two surfaces in contact from sliding past each other

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Rolling Friction

When an object rolls over a surface, a frictional force due to rolling friction slows the object down