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Chapter 2: Motion
Vocabulary
12
Science
10th Grade
09/18/2012

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Term
distance
Definition

how far an object has moved

 

SI unit is the meter (m)

Term
displacement
Definition
the distance and direction of an object's change in position from the starting point
Term
speed
Definition

distance an object travels per unit of time

 

s=d/t

Term
average speed
Definition

total distance traveled divided by the total time of travel

 

 (example:  the distance from your house to school divided by the time it took to travel it)

Term
instantaneous speed
Definition

the speed at a given point in time

 

(example:  the speed on the speedometer of your car)

Term
velocity
Definition

speed of an object

and

the direction of its travel

Term
acceleration
Definition

rate of change of velocity

 

(going faster on the entrance ramp to I-75)

 

a=final v - initial v

t

Term
force
Definition
a push or pull
Term
net force
Definition
combined forces on an object
Term
balanced forces
Definition

Forces that are equal in size and opposite in direction

 

result is zero

Term
inertia
Definition
the tendency of an object to resist a change in motion
Term
Newton's First Law
Definition

an object moving at a constant velocity keeps moving at that velocity unless an unbalanced net force acts on it.

 

An object at rest tends to stay at rest.

 

The law of inertia.

 

Without a safety belt, a passenger will continue moving forward in the car crash.

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