CHAPTER 12. FORCE,MOMENTUM AND IMPULSE 12.6
- [IEB 2004/11 HG1] Two identical billiard balls collide head-on witheach other. The
first ball hits the secondball with a speed of V, and the second ball hits the first ball
with a speed of 2V. Afterthe collision, the first ball moves off in the opposite direction
with a speed of 2V. Which expression correctlygives the speed of the second ball
after the collision?
(a) V
(b) 2V
(c) 3V
(d) 4V
- [SC 2002/11 HG1] Which one of the following physical quantities is the same as the
rate of change of momentum?
(a) resultant force
(b) work
(c) power
(d) impulse
- [IEB 2005/11 HG] Cart X moves along a smooth track with momentum p. A resultant
force F applied to the cart stops it in time t. Another cart Y has only half the mass of
X, but it has the same momentum p.
X
2 m
p
F
Y
m
p
F
In what time will cart Ybe brought to rest whenthe same resultant force F acts on
it?
(a)^12 t
(b) t
(c) 2 t
(d) 4 t
- [SC 2002/03 HG1] Aball with mass m strikes a wall perpendicularly with a speed,
v. If it rebounds in the opposite direction with the same speed, v, the magnitude of
the change in momentum will be ...
(a) 2 mv
(b) mv
(c)^12 mv
(d) 0 mv
- Show that impulse and momentum have the same units.
- A golf club exerts an average force of 3 kNon a ball of mass 0,06 kg. If the golf club
is in contact with the golf ball for 5 x 10−^4 seconds, calculate
(a) the change in the momentum of the golf ball.
(b) the velocity of the golf ball as it leaves the club.
- During a game of hockey, a player strikes astationary ball of mass 150 g. The graph
below shows how the force of the ball varies with the time.
