Q8.1 No. Impulse, F t ∆ , depends on the force and the time for which it is applied.
Q8.2 No. Only in a precise head-on collision with momenta with equal magnitudes and opposite directions
can both balls wind up at rest. Yes. Assume that ball 2, originally at rest, is struck squarely by an
equal-mass ball 1. Then ball 2 will take off with the velocity of ball 1, leaving ball 1 at rest.
Q8.3 Interestingly, it is gravitation that brings the ball and the Earth together. As the ball moves downward,
the Earth moves upward, although 1025 times more slowly. The two objects meet, rebound, and
separate. Momentum of the ball-Earth system is conserved.
Q8.4 Suppose car and truck move along the same line. If one vehicle overtakes the other, the faster-moving
one loses more energy than the slower one gains. In a head-on collision, if the speed of the truck is less
than
times the speed of the car, the car will lose more energy.
Q8.5 Choose the same momentum. Then the velocity of the bowling ball is at a minimum.
Problems
