Section 1
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Coulomb's Law (force between charges)
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Date created
Mar 1, 2020
Cards (85)
Section 1
(50 cards)
Coulomb's Law (force between charges)
F= force equal and opposite on charges (N) k=9x10^9 q=charge (C) r = distance center to center *opposite signs attract *like signs repel
Hooke's Law (springs)
F= force stretching or compressing a spring(N) k= spring constant/force constant (N/m) x= how much spring is stretched or compressed (m) *F=ma
position as a function of time for simple harmonic motion (mass on spring)
RADIAN MODE x=position (meters) A= amplitude (meters) f=frequency (Hz)
Work
*carrying a book across a room is not work *to do work the force must be parallel to displacement *friction does negative work Joules
impulse
vector! change of direction means double the impulse WATCH SIGN for VELOCITY
conversion for linear and angular velocity
v=velocity (m/s) w=angular velocity (rad/s) r= radius (m)
area of a velocity vs time graph
x=vt displacement
Work-Energy Theorem
*Work is the change of kinetic energy *object speeding up or slowing down *option to Newton's 2nd Law approach Joules
resistance
R= resistance (ohms) resistivity (ohm meters) L=length (m) A= cross-sectional area (circle for wires) (m^2) *Longer the wire the more the resistance *the greater the area the smaller the resistance
energy from power
Energy= power * time Joules
Conservation of Mechanical energy
*one object *use for swinging objects, springs, roller coasters *potential loss is kinetic gained
adding resistors in series and parallel
Newton's 3 Laws
3rd law means forces are equal and opposite
frequency for simple harmonic motion
f=frequency (Hz) T=period (s) w=angular frequency (rad/s) *use parenthesis in calculator
Weight
*depends on location and planet * Force is weight measured in Newtons *mass is m measured in kg *g is acceleration due to gravity (9.8 for Earth)
Third kinematics equation (constant acceleration) no time given
*speed up or slow down m/s m m/s/s
current
*direction is from positive side of battery towards negative sign of battery I= current (Amps) q= charge (C) t = time *flow of charge through a cross sectional area of wire *equal in series (one pipe=one current)
Period of a mass on a spring
*doesn't change if you go to a different planet *period is time for one complete cycle *use parenthesis in calculator T= period (s) m= mass (kg) k= spring/force constant (N/m)
universal law of gravitation
F = force (equal and opposite on masses) G=6.67x10^-11 m = mass (kg) r = distance center to center (m) Force = mg or ma or mv^2/r
angular momentum (something going in a circle like a spinning ice skater)
L= angular momentum kgm^2/s I= rotational inertia kgm^2 w=angular velocity rad/s *when ice skater brings arms in I decreases which increases w
Fourth Kinematics Equation (constant acceleration) no acceleration given
*speed up or slow down meters m/s seconds
acceleration due to gravity
g= m/s/s acceleration due to gravity M = Mass of planet (kg) r = distance from the center of the plant to object location (m)
resistors in parallel
*multiple paths/ more pipes/two finger rule *voltage is equal *current adds up
slope of a force vs acceleration graph
m=F/a mass
wave speed
v= wave speed (m/s) f=frequency (Hz) wavelength (m) *deceiving equation , wave speed only depends on medium
conversion for linear and angular acceleration
a= acceleration m/s/s alpha= angular acceleration rad/s/s r= radius (m)
resistors in series
longer means increased resistance *one path/ one pipe/ one *current is equal *voltage adds up
Rotational Kinetic energy
*object turning like a spinning wheel K= kinetic energy (joules) I= rotational inertia (kgm^2) w= angular velocity (rad/s)
slope of a velocity vs time graph
a= change of v/time acceleration
radial/ centripetal acceleration
change direction acceleration m/s/s
Power
rate of energy change Watts
Second kinematics equation (constant acceleration) no final velocity given
*speed up or slow down *most often used for projectile motion
Newton's Second Law
*vector addition *right-left=ma or up-down=ma *one of the above equations acceleration=0 **watch direction for a** *mass is measured in kg
Force of kinetic friction
*depends on materials and normal force acting on object *Normal comes from up-down=ma equation *Newtons *coefficient is unitless
net torque for system
torque (Nm) I= rotational inertia (kgm^2) angular acceleration (rad/s/s) *object like a see saw speeding up or slowing down but going in a circle
angular frequency for mass on spring
w = angular frequency (rad/s) k=spring/force constant (N/m) m= mass (kg)
slope of a position vs time graph
v=x/t velocity
momentum
vector! Watch sign for VELOCITY
kinetic energy
scalar, never negative if you are moving you have kinetic energy
total acceleration
no angular acceleration m/s/s *object speeding up/slowing down and turning
First kinematics equation (constant acceleration) no displacement given
*speed up or slow down *acceleration is how quickly velocity changes
constant angular velocity
w= angular velocity (rad/s) angular displacement (rad)
Period of an simple pendulum
*depends on planet/ location *period is time for one complete cycle (s) *L is length of string (m) *g is 9.8 for Earth
Gravitational Potential Energy
U= potential energy (Joules) m= mass (kg) g=acceleration due to gravity (-9.8 Earth) y= vertical position from bottom (not ground) *swinging objects *roller coasters *used in conservation of energy U+K=U+K
Elastic Potential Energy for a spring
U= potential energy (Joules) k= spring constant / force constant (N/m) x= how much spring is stretched or compressed (m) *Use in conservation of energy U+K=U+K
linear/tangential velocity for circular motion
T is period= time for one complete circle x=vt where x is circumference m/s
Universal Gravitational Potential Energy
object with a planet U= potential energy (Joules) G=6.67x10^-11 r=distance center to center (m) m=mass (kg)
power
rate of energy dissipated by resistor or rate of energy converted by battery *P= power (watts) *I= current (amps) *V= electric potential difference (volts)
Force of static Friction
*from freebody diagram *Normal comes from up-down=ma equation *Newtons *coefficient is unitless
conservation of energy with friction
Object moving with friction *energy at one time = energy at later time + work done by friction U+K=U+K+W
Section 2
(35 cards)