Momentum Unit Test
Answer:
1. A 0.5 kg drone traveling 15 m/s crashes into a tree. What is the momentum of the drone before and after the crash?
- 7.5 kg ⋅ m/s before and 0 kg ⋅ m/s after
2. A water balloon is thrown toward a target at 18 m/s. If the water balloon has a mass of 0.4 kg, what is its momentum?
- 7.2 kg ⋅ m/s
3. What is the momentum of a car with a mass of 2,000 kg moving at a constant velocity of 20 m/s?
- 40,000 kg⋅m/s
4. A large metal ball is at rest, and a small rubber ball is moving at a high velocity. When they collide, the large metal ball begins to roll slowly. What must have happened to the momentum of the small rubber ball?
- It must have decreased.
5. If an astronaut in space pushes off the satellite she is working on, what will happen to her if there are no other acting external forces?
- She will move in the same direction at the same speed forever
6. Which situation best represents a closed environment?
- two balls colliding in deep space
7. Which force, in real life, will have the least effect on a bowling ball rolling down a lane toward bowling pins?
- magnetism
8. Which series of steps describes how to demonstrate conservation of momentum in a system of two moving particles that collide?
- Determine the momentums of the two particles before the collision and add them together. Determine the momentums of the two particles after the collision and add them together. Verify that both sums are the same.
9. Two ice skaters want to prove conservation of momentum. Skater A has a mass of 72 kg, and skater B has a mass of 48 kg. They are originally at rest. They hold hands and face each other. They then push off each other and move in opposite directions. Skater B moves with a velocity of 3 m/s.
What must the velocity of skater A be in the opposite direction after the push in order to prove conservation of momentum?
- 2.0 m/s
10. An ice skater at rest on ice catches a dance partner moving 2.5 m/s during a performance. The ice skater has a mass of 68 kg and the dance partner has a mass of 54 kg. What is the speed of the ice skater and dance partner after the collision?
- 1.1 m/s
11. A machine works with an efficiency of 18%. The energy input is 500 joules/second. How much useful energy will the machine generate in 15 minutes?
- 81 kJ
12. A lever is being used to try to lift a heavy object, but it is not working. Which of these actions would increase the output force the most?
- Increase the input force and decrease the output displacement.
13. A box with a weight of 50 newtons rests at the bottom of a ramp and is pushed to the end of the ramp with a force of 20 newtons. This ramp is an inclined plane that is 10 meters long. What is the maximum height of the ramp?
- 4 m
Explanation:
Please mark me brainliest.
These are 100% right I just finished the Test.
If you need the other answer just say and I will help out.
