1.1 Intro To Physics: Units, Accuracy, Uncertainty, Kinemarics

Question 1

Define the concept of a unit

Answer 1

A unit is a unique name we assign to measures (meter) of that quantity (length)

Question 2

The Fundamental quantities of physics are

Answer 2

Length
Time
Mass
Electrical current
Temperature
Amount of substance and luminosity

Question 3

What system of units is used in physics

Answer 3

The SI system which contains base units like metre for length, seconds for time and kg for mass.

Question 4

Type of physical quantity: length

Unit?

Answer 4

Metre (m)

Question 5

Type of physical quantity: time, duration

Unit?

Answer 5

Second (s)

Question 6

Type of physical quantity: mass

Unit?

Answer 6

Kilogram (kg)

Question 7

Type of physical quantity: current

Unit?

Answer 7

Ampere (A)

Question 8

Type of physical quantity: thermodynamic temperature

Unit?

Answer 8

Kelvin (K)

Question 9

Type of physical quantity: luminous intensity

Unit?

Answer 9

Candela (cd)

Question 10

Type of physical quantity: amount of substance

Unit?

Answer 10

Mole (mol)

Question 11

Nano (n)

Answer 11

10^-9

Question 12

Micro (μ)

Answer 12

10^-6

Question 13

Milli (m)

Answer 13

10^-3

Question 14

Kilo (k)

Answer 14

10^3

Question 15

Mega (M)

Answer 15

10^6

Question 16

Giga (G)

Answer 16

10^9

Question 17

Accuracy?

Answer 17

How close something is to the accepted standard. To closer the more accurate

Question 18

Precision?

Answer 18

The consistency of something
Not necessarily related to the accepted standard.

Question 19

3 rules for significant figures?

Answer 19

1. Use all digits while solving. Solution can be rounded not the steps leading to the solution.
2. When multiplying or dividing two numbers the solution should be rounded to the same number of significant figures as the number in the calculation with the least significant figures
3. When adding or subtracting numbers the solution should be rounded to the same number of decimal places as the number in the calculation with the least number of decimal places

Question 20

How many sig figs in 0.00682

Answer 20

3 the 6 8 and 2 because leading zeros are never significant

Question 21

Scientific notation for 0.00682?

Answer 21

To the right (-) so 6.82 x 10^-3

Question 22

Sig figs 1.072?

Answer 22

4, imbedded zeros in between numbers are always significant

Question 23

Scientific notation 1.072?

Answer 23

1.072 (x 10^0)

Question 24

Sig figs 300?

Answer 24

1, trailing zeros are only significant if there is a decimal point

Question 25

Scientific notation 300?

Answer 25

3 x 10^2 (100) not 3.00, decimal only if original number had a decimal

Question 26

Sig figs 300. ?

Answer 26

3, trailing zeros are only significant if there is a decimal point (which there is)

Question 27

Scientific notation 300. ?

Answer 27

Left is (+), 3.00 x 10^2

Question 28

Sig figs 300.0 ?

Answer 28

4, trailing zeros are only significant if there is a decimal point

Question 29

Scientific notation 300.0 ?

Answer 29

3.000 x 10^2

Question 30

Sig figs 1.0 and 1.10?

Answer 30

2 and 3, trailing zeros are only significant if there is a decimal point and the above are considered trailing zeros

Question 31

What to do when confused with sig figs

Answer 31

Convert into Scientifiv Notation then count the number/s before the x10

Question 32

Answer 32

Question 33

What is the length of the path an object takes when travelling from point A to point B?

Answer 33

Distance

Question 34

Distance is a ________ quantity

Answer 34

Scalar

Question 35

Scalar means

Answer 35

Magnitude only

Question 36

The distance travelled with direction associated is

Answer 36

Displacement

Question 37

Displacement is a _______ quantity

Answer 37

Vector

Question 38

Vector means

Answer 38

Magnitude and direction.

Question 39

If an object moves from x1=5m to x2= 200m and back to x1= 5m, the displacement from start to finish is?

Answer 39

0, since its the overall change in position and there it is currently at the same position

Question 40

If a question asked for direction and displacement with units of distance and direction we

Answer 40

Use the units for distance for distance (miles) and units of distance and direction for displacement (miles, East)

Question 41

Average velocity is defined as

Answer 41

Displacement divided by the elapsed time

Question 42

Average Velocity is represented with the unit

Answer 42

m/s

Question 43

Since average velocity includes displacement and displacement is vector then velocity is

Answer 43

Vector (signifies both magnitude- of how fast movement is and direction)

Question 44

_________ is how fast a particle/object is moving

Answer 44

Average speed

Question 45

Speed is represented as

Answer 45

Distance over time

Question 46

Since average speed involves the total distance (independent of direction- not including direction), speed is

Answer 46

Scalar

Question 47

An object whose velocity is changing is said to be

Answer 47

Accelerating

Question 48

When an objects velocity changes from 0 to 80 km/h it is

Answer 48

Accelerating (change in velocity)

Question 49

Acceleration specifies how rapidly the velocity of an object is changing; therefore, average acceleration is defined as

Answer 49

Change in velocity over the change of time

Question 50

What is m/s^2 a common unit of

Answer 50

Acceleration

Question 51

All objects falling freely towards earth have the same acceleration of

Answer 51

9.81 m/s^2

Question 52

The value of constant acceleration g=9.81 m/s^2 is more commonly known as

Answer 52

Acceleration due to gravity

Question 53

What does the following graph represent

Answer 53

An object at rest

Question 54

Answer 54

150

Question 55

nm stands for nano meter and is 10^-6 true or false

Answer 55

False 10^-9

Question 56

The Si unit of Speed (v) is

Answer 56

Meter per second, m/s