Chapter 3: Motion, Acceleration, and Forces 

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20 Terms

1

Vector

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

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2

Acceleration

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

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3

Force

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

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4

Terminal Velocity

The ________ is the highest velocity the falling object will reach.

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5

Air Resistance

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

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6

Friction

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

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7

Displacement

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

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8

Reference Frame

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

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9

Displacement

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

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10

Speed

the distance an object travels per unit of time

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11

Instantaneous Speed

the speed at a single instant of time

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12

Average Speed

the total distance traveled divided by the total travel time

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13

Velocity

the speed of the object and its direction of motion

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14

Acceleration

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

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15

Net Force

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

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16

Balanced Forces

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

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17

Unbalanced Forces

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

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18

Static Friction

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

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19

Sliding Friction

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

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20

Rolling Friction

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

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