Physics 1 Quiz 2 Chapter 9: Momentum and Its Conservation
P=mv
DO NOT WRITE ON THIS TEST
Ft=∆P
1.
______ What is the momentum of a 200 kg car traveling at 35 m/s?
(a) 7.0 x 103 kg m/s
(b) 3.5 x 104 kg m/s
(c) 7.0 x 104 kg m/s
(d) 7.0 x 105 kg m/s
2.
________ A 1000 kg car moving at 10 m/s strikes a stone wall and is brought to a halt in 1 sec. The
average force of the car on the wall is ___.
(a) 10 N (b) 1000 N (c) 10,000 N (d) 100,000 N
3.
________ An impulse of 10 N  s acting on an object whose mass is 2 kg will cause a change in the object’s
velocity of ___.
(a) 5 m/s (b) 2 m/s (c) 10 m/s (d) 50 m/s
4.
______Which object has the least momentum?
(a) m = 1 kg; v = +100 m/s
(b) v = +12m/s; m = 10 kg
(c) m = 0.5 kg; v = +1000 m/s
(d) v = +2 m/s; m = 100 kg
5.
_______ The reason car dashboards are padded is to shorten the time of impact in the case of a collision.
(a) True (b) False
6.
________If a 54 N  s impulse is given to a 6.0 kg object, the change of momentum for the object
is:
(a) 45 N  s (b) 6 N  s (c) 324 N  s (d) 54 N  s (e) 9 N  s
7.
________A collision where the momentum and the kinetic energy are conserved is called a(n):
(a) elastic (b) inelastic (c) perfectly inelastic
(d) explosion (e) all of the preceding (f) (a) and (d) only
8.
_______Two objects move toward each other, collide, and separate. If there was no external force acting
on the objects, but some kinetic energy was lost, then:
(a) the collision was elastic and total momentum was conserved.
(b) the collision was not elastic and total momentum was conserved.
(c) the collision was elastic and total momentum was not conserved.
(d) the collision was not elastic and total momentum was not conserved.
9.
_______A 0.0367 kg baseball, initially moving at a speed of 12 m/s, is struck by a baseball bat causing it to
travel in the opposite direction at a speed of -18 m/s. What is the change in momentum of the baseball?
(a) 0.36 kg*m/s
(b) 0.72 kg*m/s
(c) 1.8 kg*m/s
(d) 1.1 kg*m/s
10.
_______ On a momentum –velocity graph, the slope of a line is equal to the object’s _____.
(a) force
(b) impulse
(c) time
(d) mass