Week 1: Electric Force

Question 1

Electric Constant, k_e

Answer 1

9x10^9 N*m^2/C^2

Question 2

Units of Force

Answer 2

N, Newton

Question 3

nm to meters

Answer 3

x10-9 meters

Question 4

Direction of Electric Force

Answer 4

r hat

Question 5

r hat

Answer 5

direction along the line connecting 2 charges

Question 6

‘hat’

Answer 6

indicates direction, does not change magnitude

Question 7

Unit of length

Answer 7

m, meters

Question 8

acceleration is…

Answer 8

time derivative of velocity

Question 9

x, y, z in phys notation

Answer 9

i, j, k

Question 10

Electric force equation

Answer 10

F = k q1 q2/r^2 x r hat

Question 11

How to sum of forces

Answer 11

Break forces into components and add like components

Question 12

Sine defined in terms of the legs of a right triangle

Answer 12

Opposite/ Hypotenuse

Question 13

Cosine defined in terms of the legs of a right triangle

Answer 13

Adjacent/Hypotenuse

Question 14

r hat definition

Answer 14

Direction of line connecting 2 charges

Question 15

nm in scientific notation

Answer 15

x10^-9 meters

Question 16

gravity

Answer 16

g=9.81 m/s^2

Question 17

Charge of Proton

Answer 17

1.6 x 10^-19 C

Question 18

Unit of Charge (q)

Answer 18

C, Coulombs

Question 19

Newtons 2nd Law

Answer 19

Sum of F=ma

Question 20

Unit Prefix -pico

Answer 20

x10^-12

Question 21

Variable for x direction

Answer 21

i hat

Question 22

Variable for y direcition

Answer 22

j hat

Question 23

r hat

Answer 23

(rhat) = horizontal component * (ihat) + vertical component * (jhat)

Question 24

Avogadro’s number

Answer 24

6.02 x 10^23

Question 25

Superposition

Answer 25

Forces linearly add

Question 26

Tangent defined in terms of triangle legs

Answer 26

Opposite/Adjacent

Question 27

Opposite electric charges

Answer 27

Attract

Question 28

Same Electric Charge

Answer 28

Repel

Question 29

What is r variable in electric force equation?

Answer 29

Distance bewteen two particles

Question 30

How to know which direction r^ (hat) is pointing in?

Answer 30

Points towards particle that you are trying to find the force acted upon

Question 31

Unit of charge

Answer 31

coulomb

Question 32

What is a force?

Answer 32

Acts on a pair of objects / Interaction

Question 33

milli

Answer 33

10^-3

Question 34

kilo

Answer 34

10^3

Question 35

Acceleration defintion

Answer 35

Change in velocity over time

Question 36

Fnet

Answer 36

ΣF (sum of forces)

Question 37

conserving electric charge means:

Answer 37

the total sum of the negative and positive charge in the universe does not change

Question 38

charge of a neutron

Answer 38

no charge

Question 39

Coulumbs Law

Answer 39

F=(k_e q1 q2/r^2) r hat

Question 40

micro

Answer 40

10^-6

Question 41

Newton’s Third Law

Answer 41

Forces come in equal and opposite pairs and result from an interaction between two particles.

Question 42

Newton’s First Law

Answer 42

An object in motion stays in motion; an object at rest stays at rest, unless a net outside force acts on it