Chapter 5 Review
Answer on a separate notebook paper
1. A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the
A) force against the rifle is smaller than against the bullet.
B) momentum is mainly concentrated in the bullet.
C) rifle has much more mass than the bullet.
D) momentum of the rifle is smaller.
2. Suppose that a tiny gun made of a strong but very light material fires a bullet that is more massive than the gun itself. For such a weapon
A) conservation of momentum would not hold.
B) recoil problems would be lessened.
C) conservation of energy would not hold.
D) the target would be safer than the person shooting the rifle.
E) both conservation of energy and momentum would not hold.
3. Two objects have the same size and shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater
A) speed.
B) acceleration.
C) mass.
D) momentum
E) Two of these
4. A car traveling along the highway needs a certain amount of force exerted on it to stop it in a certain distance. More stopping force is required when the car has
A) more mass.
B) more momentum.
C) less stopping distance.
D) all of these
E) none of these
5. The force on an apple hitting the ground depends upon
A)
the speed of the apple just before it hits.
B) the time of impact with the ground.
C) whether or not the apple bounces.
D) all of these
6. A 5 kg ball has a momentum of 20 kg m/s. What is the ball's speed?
7. A ball is moving at 3 m/s and has a momentum of 36 kg m/s. What is the ball's mass?
8. Compared to the force that brings a small car to a stop, the force required to bring a heavy truck to a stop
A)
is less.
B) is more.
C) is the same.
D) impossible to determine without additional information
9. A 2000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is
10. A9-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after this lunch is
11. A 6-kg shark swimming at a speed of 2 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after this meal is
12. A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of
A) less than 1 unit.
B) more than 1 unit.
C) 1 unit.
D) not enough information
13. Consider massive gliders that are together on a friction-free along a horizontal air track. Glider A has a mass of 1 kg and Glider B has a mass of 3 kg. Both are at rest and are together. When they push off of one another, the larger glider goes 2 m/s. How fast will the smaller glider go?
14. A 1-kg glider and a 3-kg glider both slide toward each other at 1 m/s on an air track. They collide their magnetic properties cause them to repel from each other after the collision. How much faster will the smaller glider go than the larger glider?
15. Two identical gliders slide toward each other on an air track. One moves at 1 m/s and the other at 3 m/s. They collide and stick. The combined mass moves at
16. A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg car?
17. A car moves with a mass of 100 kg and moves at 2 m/s. If the braking force was 100N, how long did it takit take to stop the car?
18. Aleisha (40 kg) is standing on ice and catches a heavy bouquet of flowers (10 kg) tossed to her at 2 m/s. m/s. What is the speed of Aleisha and the flowers after the catch?
19. Two people stand together at rest on ice wearing ice skates. One person weighs 180 lbs and the other person weighs 60 kg. They push off of each other. The smaller person goes 2 m/s. How fast does the larger person go? (You must show correct set up for this)