Δx = area under v-t graphΔv = area under a-t graph
Fnet = ma
the sum of all forces causes a mass to accelerate
Ff = μFN
the friction force is caused by an object pressing on another object
a torque is generated when a force acts a perpendicular distance from a pivot point
p = mv
momentum comes from a mass moving at a velocity
J =FΔt (when the force is constant)
J =area (when the force changes)
impulse is a force acting during a time period
FΔt = mΔv (when force is constant)
impulse is equal to the change in momentum
m1v01+ m2v02= m1v1+ m2v2
the total momentum before a collision/explosion is equal to the total momentum after
K = 1/2 mv2
kinetic energy is the energy of a mass with a velocity
Ug = mgh
gravitational potential energy is the energy of a mass in a gravitational field with height
W = FΔx
work is the energy done by an external force moving through a displacement
P = Fv
power is the rate at which an external force moves through a displacement
Fs = kΔx
the force in a spring is generated when a spring with a constant k is stretched a distance of Δx
Us = 1/2 kΔx2
the energy stored in a spring when it is displaced
The charge stored on a capacitor depends on voltage and capacitance.
Voltage is proportional to current times resistance.
All parallel resistors have the same voltage. The current in each branch add up to the total.
n=1,2,3,4…The sound wave in a pipe open at both ends resonates at every ½ wavelength.
n=1,3,5,7…The sound wave in a pipe open at both ends resonates at every ½ wavelength, starting with ¼ wavelength