A car whose mass is 725
kg moves to the east at 15
m/s. What is the
magnitude and direction
of the momentum of the
car?
If a second car of mass
2175 kg had the same
momentum as the
previous car,
what would
its velocity be?
A 0.144 kg baseball is pitched at
38 m/s It is hit by the bat and
moves at the same speed but in
the opposite direction. Draw
a before and after
picture. What is
the impulse? If
the contact time is 8 x 10-4 s,
what force did the bat exert?
A billiard ball with a mass of
0.195 kg and a velocity of 0.850
m/s to the right is deflected by
the cushioned edge of the
billiard table. The cushion exerts
a force of 3.50 N to the left for
0.0750 s. What is the ball’s final
velocity?
A rock with m = 17000 kg slides
with a speed of 25 m/s (assume
friction is negligible). The rock
suddenly explodes into 2 pieces,
one piece with mass = 9,000 kg
moves in the positive x-direction
with v = 14 m/s. What is the
velocity of the second
piece?
A 2 g bullet w/ v1 = 538 m/s
strikes a 0.25 kg piece of wood
on a frictionless surface. The
bullet remains in the wood.
What is the final speed of the
bullet-block?
A 2275 kg car going 28 m/s
rear ends a 875 kg car going
16 m/s in the same direction.
If the two cars stick together
how fast does the wreckage
move
after the collision?
Ball A with m = 15 kg and initial
velocity of 3.5 m/s to the right
collides elastically with a second
ball. Ball B has a mass of 22 kg
and initial velocity of 4 m/s to the
left. If Ball A has a final velocity
of 5.4 m/s to the left, what is the
final velocity of Ball B?
Colliding Trains
vf= ?
Colliding Trains (in-elastic)
Before
m1 = 18,000 kg
v1i = 8 m/s
After
m2 = 24,000 kg
v2i = 0 m/s
Boy and a girl ice skaters collide
and embrace in a collision. The
boy whose mass is 35 kg is
originally moving east w/ v = 6.2
m/s. The girl whose mass is 22 kg
is originally moving north w/ v =
7.8 m/s. What is the v of the pair
after the collision? What is their
direction?
Ball A is 2 kg and is moving to
the right at 5 m/s. It elastically
collides with stationary ball B
(same mass). After the collision,
ball A moves at 30° above the
horizontal with a velocity of 4.33
m/s, while ball B moves at an
angle below the horizontal.
What is the vf of Ball B?