science chapter 1 Flashcards

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1
Q

the starting point you choose to describe the location, or position of an object

A

reference point

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2
Q

an object’s distance and direction from a reference point

A

position

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3
Q

A complete description of your position includes…(3 things)

A

a distance, a direction, and a reference point

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4
Q

State the steps in order to describe position

A

choose a reference point, then describe the direction your object is from that reference point, and finally say how far the object is from the reference point

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5
Q

The description of an object’s position depends on the

A

reference point

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6
Q

The description of the object’s position changes because

A

the reference point is different, but the object’s position did not change at all.

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7
Q

When you describe an object’s position

A

you compare its location to a reference direction

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8
Q

When you describe a position using two directions, you are using

A

two dimensions

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9
Q

State the steps of finding a position in two dimensions

A

choose your reference point, specify reference directions, and finally determine the distance along each reference direction

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10
Q

the process of changing position

A

Motion

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11
Q

the difference between the initial (first) position and the final position of an object

A

displacement

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12
Q

a measure of the distance an object travels per unit of time

A

speed

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13
Q

how can you calculate speed?

A

dividing distance traveled by the time it takes to go that distance

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14
Q

What is the unit for speed?

A

SI (m/s)

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15
Q

the rate of change of position in which the same distance is traveled each second

A

Constant speed

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16
Q

speed at a specific instant in time. (constantly changing)

A

Instantaneous

17
Q

the total distance traveled divided by the total time taken to travel that distance

A

Average speed

18
Q

how can you calculate the average speed?

A

by dividing the total distance by the total time

19
Q

v- represents

A

“average velocity”

20
Q

Distance time-graphs are used to compare

A

the motion of two different objects

21
Q

how do you use time-distance graphs to calculate speed?

A

choose two points on the line, find the time and distance differences, and divide the distance difference by the time difference

22
Q

the speed and the direction of a moving object

A

velocity

23
Q

the length of Arrows representing velocity…

A

indicates the speed

24
Q

velocity changes when the ________ and/or _________ changes

A

speed, direction

25
Q

a measure of the change in velocity during a period of time

A

acceleration

26
Q

how do you calculate acceleration?

A

final speed - initial speed divided by the total time (final time - initial time)

27
Q

what is the unit for acceleration?

A

(m/s2)

28
Q

When an object is at rest, it is shown as…

A

y = 0

29
Q

Speed-Time graphs cannot show

A

direction