exam 3 Flashcards
(26 cards)
W=
Fcos0s
Wgravity=
mg(h1-h2)
define gpe
energy object has by virtue of its position
Fs=
-kΔx
EPE=
1/2k(Δx)^2
define internal forces
forces that objects within the system exerts on each other
define external forces
forces exerted on objects by agents external to the system
define collision
an event where momentum and energy are exchanged
define elastic collision
total kinetic energy stays the same
define inelastic collision
total kinetic energy changes
define angular velocity
change in angular position over a period of time
w=
2pi/T
convert:
x (position)
v (velocity)
a (acceleration)
θ (position)
w (velocity)
α (acceleration)
define centripetal forces
directed radially relative to the circular path
acceleration is in _____ direction as net force
same
T=
rxF or rFsinº
Tnet=
t1+t2+t3…
or ia
+=
ccw
-=
cw
a=
wf-wi/t
define center of mass
average location for total mass of a system
Xcg=
W1X1+W2X2+…/W1+W2+…
Δθ=
wit+1/2at^2
2aΔθ=
wf^2-wi^2
