# Solved >   6) A ball is thrown against a:1544964 …

6) A ball is thrown against a wall, bounces off, and is caught. The number of impulses acting on the ball in this case is

1) one.

2) two.

3) three.

4) none.

The greatest impulse occurs when the ball

5) is thrown.

6) bounces against the wall.

7) is caught.

8) is zero for each.

9) is nonzero, but the same for each case.

7) According to the equation Ft = change in (mv), a foam rubber dashboard is safer than a metal one, for the force of impact, F, of an occupant against the dash is lessened in an accident. The “m” in this equation stands for the

1) mass of the car,

2) mass of the person,

3) momentum of the car,

4) momentum of the person,

and the “v” stands for the

5) velocity of the car.

6) speed at which the person hits the dashboard.

7) relative velocity between cars in a collision.

8) change in velocity, which is 9.8 m/s2.

8) A Volkswagen and a Cadillac are moving at the same speed when they crash into a cement wall and stop equally quickly. The car to have the greater force of impact will be

1) the Volkswagen,

3) neither?they will have an equal force of impact

because

4) they are traveling at the same speed.

5) the Cadillac’s momentum is much greater.

6) the Volkswagen has a greater change in velocity upon impact.

7) they both have equal momentum.

9) We can apply the equation Ft = change in (mv) to the case of a baseball player striking a pitched ball. To impart the maximum change in momentum, mv, to the ball, the batter hits the ball with the greatest force he can muster and he also

1) extends the time of contact as much as possible by “following through.”

2) makes the time of contact as short as possible, thereby increasing the force.

3) none of the above!

In the impulse-momentum equation above, the “v” stands for

4) the velocity of the bat.

5) the velocity of the ball.

6) vector.

10) The momentum of the punch is stopped by the fighter’s jaw. He “rides with the punch” so as to

1) decrease the velocity of the blow,

2) increase the time of contact of the blow,

and thereby reduce the

3) force.

4) impulse.

5) momentum.

6) quanta.

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