Numbers In Physics

Question 1

What do numbers in physics usually come from?

Answer 1

An instrument

Question 2

What is a symbol?

Answer 2

The sign that indicates what the number is about
Ex: m= 23 kg
M=symbol

Question 3

What is a unit?

Answer 3

Tells how the number is measured(ex. Kilogram, gram, etc.)

Question 4

What are the two different types of numbers in physics called?

Answer 4

Scalars and vectors

Question 5

What do scalars measure?

Answer 5

Size(magnitude) only

Question 6

What do vectors measure?

Answer 6

Size and direction

Question 7

What are examples of the things scalars are used to measure?

Answer 7

Time
Mass 
Energy
Power
Charge
Too Much Energy Per Crap

Question 8

What are examples of the things vectors are used to measure?

Answer 8

Force 
Acceleration
Velocity
Momentum
Forget About Virtual Moments

Question 9

How do you add scalars?

Answer 9

Just like math class: 2 sec+3 sec=5 sec

Question 10

How do you add vectors?

Answer 10

More challenging than scalars: if you walk 2 feet, stop, and then walk 2 more feet, how far from your starting point are you?
Could be anywhere from 0-4 depending on direction you walk

Question 11

T/F: It’s ok to add numbers with different units

Answer 11

FALSE: Never add numbers with different units

Question 12

When you multiply or divide numbers, what do you do to the units?

Answer 12

You do the exact same thing to the units
Ex: 2 meters X 4 meters= 8 meters^2
Ex: 25 miles divided by 5 hours= 5 miles/ hour
Ex: 8kg/4kg=2

Question 13

What can a negative sign mean?

Answer 13

A negative sign can be a DIRECTION(backwards) not less than

Question 14

Precision

Answer 14

• depends on the sensitivity of the instrument

- a more precise instrument is going to give similar values if the measurement is repeated

Question 15

Accuracy

Answer 15

How does the measurement compare to the actual value?

Question 16

What is the formula for percent error?

Answer 16

(Your value- actual value)/actual value X100

Question 17

What is basic(raw) data?

Answer 17

A measurement you make directly with the instrument

Question 18

What is derived(cooked) data?

Answer 18

A number that is found through some type of calculation with more basic numbers

Question 19

What do you do with derived units renamed to honor famous physicists?

Answer 19

ALWAYS CAPITALIZE

Question 20

What is scientific notation?

Answer 20

A short-hand way of writing large numbers without writing all of the zeros

Question 21

Ex: 93,000,000

Answer 21

Step One:

• move decimal left
• leave only one number in front of the decimal
• 93,000,000=9.3000000

Question 22

What is next step?

Answer 22

-Count how many places you moved the decimal
-make that your power of ten
93,000,000=9.3 X 10^7

Question 23

What do you do when converting scientific notation to standard form?

Answer 23

• move decimal to the right
• 3.4 X 10^5
• 340,000

Question 24

Solve for b:

Y=mx+b

Answer 24

B=y-mx

Question 25

Solve for c: | E=mc^2

Answer 25

C= square root of e/m

Question 26

Solve for t: | V=v0 + at

Answer 26

T= v-v0/a

Question 27

What is the metric based chart?

Answer 27

``` T(he) 12 tera G(ood) 9 giga M(an) 6 mega k(ing) 3 kilo h(enry) 2 hecto da(died) 1 deca b(y) 0 base d(rinking) -1 deci c(hocolate) -2 centi m(ilk) -3 mili M(ade) -6 micro n(ear) -9 nano p(aris) -12 pico ```