AP Physics Semester 1 Review

Force

* F=ma
* measured in Newtons

Force friction

(coefficient of friction)(Fn)

force spring

(spring constant)(amount of extension)

Newton’s first law

in the absence of a force, an object at rest stays at rest and an object in motion stays in motion

Newton’s second law

the acceleration is directly proportional to force and inversely proportional to mass F=ma

Newton’s third law

for any action there’s an equal and opposite reaction (equilibrium)

centripital force

F= m(v^2/r)

centripetal acceleration

ac=v^2/r

if it is too fast

friction goes outward

if it is too slow

friction goes inward

universal gravitation

Fg=Gm1m2/r^2

kepler’s first law

planetary orbits are elliptical

kepler’s 2nd law

equal areas of space are swept out in equal times

Kepler’s third law

R^3/T^2

KE

1/2mv^2

PE

mgh

mechanical energy

is conserved

momentum

is always conserved

elastic collisions

KE is conserved

elastic energy

1/2kx^2

work

Fd

power

w/t

momentum equation

mv (kgm/s)

impulse

F(Delta)t or m(delta)v

relationship between tengential velocity and angular velocity

v=wr

inertia

an object’s resistance to change in action

KR

.5Iw^2

torque

Fdsintheta or I(alpha) or change in momentum/change in time

work

KRinitial-KRfinal

momentum (L)

Iw or mvr