PHYSICS unit 3
if you knew mass, the formula that would help you find velocity would be
m1vi1+m2v2i=m1v1f+m2v2f
the rock's kinetic energy plus its potential energy act as ___ to perform work
mechanical energy
the joule is equivalent to the amount of work it takes to move one ____ one meter
newton
momentum
p=mv
power
p=w/t
a rock on the edge of a cliff has ___ energy
potential
the amount of work done to move the tire 5 miles in 5 mins is equal to the ____ necessary to perform that task
power
the tire and the axle it is attached to tend to remain in rotation due to ____. that is why you need brakes on a car- to stop the tires' rotating motion
rotational inertia
a watt is one joule of work performed in the time interval of one ____
second
average velocity
v= d/t
the statement " a ford mustang is moving at 63 mph northwest" describes the mustang's
velocity
rotational speed
vr= # of rotations/t
tangenital speed
vt= c (times) vr
work
w=fd
the si unit for power is the ____
watt
the amount of force needed to move the tire 5 miles is equal to the ___ required to perform the task
work
the barrel moved a certain distance. therefore, the rock's mechanical energy did perform ____
work
rotational inertia
I=md2
centripetal force pulls mass out of it's
inertial path
the si unit for work is the ____
joule
centripetal acceleration
ac=vt2/r
now the mustang chances is velocity by speeding up to 70 kph in one second. it is still traveling towards the northwest. the mustang has begun
acceleration
if the momentum of the ford mustang changed, it would be due to
an impulse
circumference
c=2(pi)r
showing that energy is conserved, is because the action shown in the storyboard must be in a(n) ____ system
closed
potential energy is ____ kinetic energy
converted into
to calculate the time it would take for a ball to fall from the thurd floor to the street, you would use the formula
d=1/2gt2
the mustang traveling at 60 kph collides head on with an suv going 27 kph in the opposite direction. the two vehicles bounce of each other and move away in opposite directions. their collision is
elastic
force
f=ma
in the english system, work is measured in ____
foot-pounds
if the mustang accidentally went off the third floor of a parking garage, it would accelerate towards the street due to the force of
gravity
the centripetal force that keeps you on earth is ___
gravity
would solid or hollow tires have LESS rotational intertia
hollow
one ____ is equal to 33000 ft-lb/min or 550 ft-lb/s
horsepower
in a parking lot, the mustang bumps into a mini cooper traveling in the same direction. their fenders lock together and for a short time, they travel together. their collision is
inelastic