physics equations Flashcards
acceleration
vf-vi/t
average speed
total distance/time
average velocity
displacement/time
When it’s slowing down, velocity and position are?
opposite signs
When it’s speeding up, velocity and position are?
the same sign
Fx
Fcos theta
fy
fsin theta
how to find theta
inverse tan (fy/fx0
Fn when fn doesnt equal mg
mg-fy
at constant velocity
a = 0
when a box is at rest on a table
Fg = ma
Fn = Fg
when a box is hanging from a ceiling
Ft = mg
T = W
when a box is pulled upwards at a constant velocity
the acceleration is zero since the velocity is constant.
ma = t-w
0 = t-w
T = mg
a block is pulled upward with a constant acceleration
T = ma + mg
What is the acceleration when there is constant speed?
a=0
when there is an angle free body problem, Fn =?
mg - fy
When there is an angle, how do you find sumfx when kinetic friction is there?
fx - fk
what is fk?
meu(FN)
for an incline, what does Fn =?
mgcos(theta)
for a box sliding down with no friction, what is the fg2?
fg2 = mgsin(theta)
how do you find the acceleration for a box sliding down an incline?
a = gsin(theta)
On an incline, when velocity is constant, what does that mean?
acceleration is zero and fT = mumgcos(theta)
On an incline, at a constant acceleration, what would you calculate the acceleration?
a = gsin(theta) - mugcos(theta))
when an incline problem asks of tension what equation do you use?
Ft = m(g-a)
Ft2 = m(g+a)
