# semester 2 final Flashcards

Kinetic energy equation

KE = 1/2mv^2

Potential gravitational energy equation

GPE = mgh

elastic energy equation

Eel = 1/2kx^2

what is work

a force applied over a distance

-the force has to be in the same direction of motion

what is power

work divided by time

what is the difference between work and power

work is force applied and power is force applied over time

define momentum

when you’re moving, momentum keeps you moving

object w a lot of momentum is hard to stop

-p=mv

define inertia

Fnet x t

I = F/t

what is impulse

the change in momentum

what is the law of conservation of momentum

the total momentum before a collision = the total momentum after a collision

what’s an elastic collision

colliding objects bounce off of one another

what’s an inelastic collision

colliding objects stick together

the area underneath a force vs time graph tells you what

Impulse or change in momentum

describe charging by conduction

charging a neutral object without touching it

describe charging by induction

taking a charged object and transferring that energy to uncharged objects, making the charges in the uncharged spheres separate

______ charges attract

opposite

_______ charges repel

like

what is electron affinity

the change in energy of a neutral atom when an electron is added

Charge of 1 electron

1 electron = -1.6 x 10^-19 C

what is Ohm’s law

V = IR

- v = voltage
- I= current
- r = resistors

define voltage

volts produce electric field to cause current to flow

define current

amount of charge that passes a spot in a given amount of time