Week 1: Electric Force Flashcards
Electric Constant, k_e
9x10^9 N*m^2/C^2
Units of Force
N, Newton
nm to meters
x10-9 meters
Direction of Electric Force
r hat
r hat
direction along the line connecting 2 charges
‘hat’
indicates direction, does not change magnitude
Unit of length
m, meters
acceleration is…
time derivative of velocity
x, y, z in phys notation
i, j, k
Electric force equation
F = k q1 q2/r^2 x r hat
How to sum of forces
Break forces into components and add like components
Sine defined in terms of the legs of a right triangle
Opposite/ Hypotenuse
Cosine defined in terms of the legs of a right triangle
Adjacent/Hypotenuse
r hat definition
Direction of line connecting 2 charges
nm in scientific notation
x10^-9 meters
gravity
g=9.81 m/s^2
Charge of Proton
1.6 x 10^-19 C
Unit of Charge (q)
C, Coulombs
Newtons 2nd Law
Sum of F=ma
Unit Prefix -pico
x10^-12
Variable for x direction
i hat
Variable for y direcition
j hat
r hat
(rhat) = horizontal component * (ihat) + vertical component * (jhat)
Avogadro’s number
6.02 x 10^23
Superposition
Forces linearly add
Tangent defined in terms of triangle legs
Opposite/Adjacent
Opposite electric charges
Attract
Same Electric Charge
Repel
What is r variable in electric force equation?
Distance bewteen two particles
How to know which direction r^ (hat) is pointing in?
Points towards particle that you are trying to find the force acted upon
Unit of charge
coulomb
What is a force?
Acts on a pair of objects / Interaction
milli
10^-3
kilo
10^3
Acceleration defintion
Change in velocity over time
Fnet
ΣF (sum of forces)
conserving electric charge means:
the total sum of the negative and positive charge in the universe does not change
charge of a neutron
no charge
Coulumbs Law
F=(k_e q1 q2/r^2) r hat
micro
10^-6
Newton’s Third Law
Forces come in equal and opposite pairs and result from an interaction between two particles.
Newton’s First Law
An object in motion stays in motion; an object at rest stays at rest, unless a net outside force acts on it
