Physics Flashcards
SOHCAHTOA
sine=opp/hyp
cos=adj/hyp
tan=opp/adj
pythagorean theorem
a2 + b2 = c2
s=
s=d/t
v=
v=Δx/t
units for speed
m/s
units for velocity
m/s but has direction
scalar
just magnitude
distance is
of steps taken
displacement is
shortest route there; position you end at relative to starting point
vector
magnitude and direction
a=
a=Δv/t
opposite=
hyp (sineΘ)
adajacent=
hyp (cosΘ)
Δx=
v0t + 1/2at^2
vf -v0=
at
vf^2 =
vo^2 + 2aΔx
v avgerage=
1/2(vf + vo)
Δx= (second formula)
(1/2 (vf + vo) )t
uniformly accelerated motion
motion with constant accelration
V product = (multiply vectors formula)
v1v2sin(Θ)
Δx versus t graph
- describes position
- straight horizontal line=stopped moving
- slope=velocity
- negative slope=object moving in opposite direction
velocity vs. time graph
- describes velocity
- straight horizontal line=constant velocity=no acceleration
- slope=acceleration
- area under graph=displacement
- moving toward center=slowing down
- at center line=stopped moving
- slope at any point is the instantaneous acceleration
v0 sine (Θ)=
√(2gh)
v=
√(2gh)
does mass affect air resistance?
no
F=
ma
inertia
tendency to remain in its present state of motion
mass
quantitative measure of object’s inertia
weight
gravitational force object exeriences
when gravity changes does mass change?
no, you have the same mass on earth and moon. weight changes
center of mass
single point at which all mass is considered to be concentrated(perfect balancing point)
the 4 forces of nature
- the strong nuclear force
- the weak nuclear force
- gravitational force
- electromagnetic force
center of gravity
the single point at which the force of gravity can be applied to the entire mass
Newtons 1st law
law of inertia: object in rest or in motion wants to stay that way unless acted upon by a net force
newtons 2nd law
when an object is acted upon by a net force, the change in that object’s state of motion will be inversely proportion to mass and directly proportional to the net force.
F=ma
newtons 3rd law
every action there is an equal and opposite reaction…but the force do NOT ACT ON THE SAME SYSTEM
newtotons law of universal gravitation
every mass in the universe exerts an attractive force on every other mass in the universe
F=
Gm1m2 /(r^2)
G (constant)
6.67 x 10^-11 (m^3)(kg^-1)(s^-2)
a c=
v2/r centripetal acceleration
Fc
mv^2 / r centripetal force
centripetal acceleration
objects speed doesnt change yet it is continually accelerating bc of change in direction
centripetal force
always points toward center
