# Ms. Goshorn's AP Physics B formula flashcards

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- Ms. Goshorn's AP Physics B formula flashcards

**Created:**2011-12-06

**Last Modified:**2011-12-06

Δx = area under v-t graph

Δv = area under a-t graphdisplacement is a change in position; velocity is the rate of change of displacement, acceleration is the rate of change of velocity

F_{net} = ma

the sum of all forces causes a mass to accelerate

F_{f} = μF_{N}

the friction force is caused by an object pressing on another object

Friction Force

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

m_{1}v_{01}+ m_{2}v_{02}= m_{1}v_{1}+ m_{2}v_{2}

the total momentum before a collision/explosion is equal to the total momentum after

K = * 1/2 mv ^{2} *

*kinetic energy is the energy of a mass with a velocity ^{}*

U_{g} = 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

F_{s} = kΔx

the force in a spring is generated when a spring with a constant k is stretched a distance of Δx

U_{s} = * 1/2 kΔx ^{2}*

*the energy stored in a spring when it is displaced*

Q=VC

The charge stored on a capacitor depends on voltage and capacitance.

V=IR

Voltage is proportional to current times resistance.

The minimum frequency of a photon that can ejecta photoelectron.

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