1-D Kinematics - Lesson 1 - Describing Motion with Words

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The Physics Classroom Website 1-D Kinematics - Lesson 1 Describing Motion with Words 1b Scalars and Vectors 1c Distance and Displacement 1d Speed and Velocity 1e Acceleration
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1

Scalar

quantities that are fully described by a magnitude (or numerical value) alone.

2

Vector

quantities that are fully described by both a magnitude and a direction.

3

Scalar or Vector?

5m

Scalar

4

Scalar or Vector?

length

Scalar

5

Scalar or Vector?

30 m/sec, East

Vector

6

Scalar or Vector?

acceleration

Vector

7

Scalar or Vector?

5 mi., North

Vector

8

Scalar or Vector?

density

Scalar

9

Scalar or Vector?

20 degrees Celsius

Scalar

10

Scalar or Vector?

temperature

Scalar

11

Scalar or Vector?

256 bytes

Scalar

12

Scalar or Vector?

time

Scalar

13

Scalar or Vector?

4000 Calories

Scalar

14

Scalar or Vector?

force

Vector

15

Scalar or Vector?

drag

Vector

16

Scalar or Vector?

displacement

Vector

17

Scalar or Vector?

momentum

Vector

18

Scalar or Vector?

pressure

Scalar

19

Scalar or Vector?

mass

Scalar

20

Scalar or Vector?

lift

Vector

21

Displacement

a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

22

Distance

a scalar quantity that refers to "how much ground an object has covered" during its motion.

23

Speed

a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance.

24

Velocity

a vector quantity that refers to "the rate at which an object changes its position."

25

Instantaneous Speed

speed at a particular instant in time.

26

Average speed

a measure of the distance traveled in a given period of time

27

Acceleration

a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

28

Constant Acceleration

an accelerating object will change its velocity by the same amount each second

29

negative acceleration

1) an object is slowing down
2) an object is speeding up in the opposite direction

30

posotive acceleration

1) an object is speeding up
2) an object is slowing down in the opposite direction


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