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 stayed the same.
It must have become zero.
It must have decreased.
It must have increased.
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?
a: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?
a: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?
a: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?
a: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?
a:She will move in the same direction at the same speed forever.
6.Which situation best represents a closed environment?
a: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?
a:magnetism
8.Which series of steps describes how to demonstrate conservation of momentum in a system of two moving particles that collide?
a: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?
a: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?
a: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?
a: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?
a:Increase the input force and decrease the output displacement. - correct
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?
a:4 m - not selected, this is the correct answer
4 m
rest you have to look up and word yourself
it must have decreased
other answers, figure it out which ones.....
40,000kg
it must have decreased
she will move in same directions forever
two balls colliding in deep space
magnetism
28kg
36 ms
equal in magnitude and opposite in directions
1.10
error formula is f net = triangle v over triangle t
acceleration increases if mass decreases and non zero constant
acceleration is zero is object is moving at a constant velocity
determine momentums before and after collision and verify if they are the same to demonstrate conservation of momentum
2.0
good luck!
on the four written questions you will have to find the answers on the web they are easy though ...you dont need to write a lot ... look up your question and then look at images...the examples are easier to understand if you see a picture.
It must have decreased
@Korra is 100% almost, questions 11 and 13. The correct for 11 is- The acceleration increases. The correct answer for 13 is- Determine the momentums of one of the particles before and after the collision and add them together. Determine the momentums of the other particle before and after collision and add them together. Verify that both sums are zero.
Essay Questions 15-19, are mine, so be aware of making them your own answers to avoid getting in trouble.
15. The momentum of the hockey puck is 6.4 Kg m/s and that of the keeper is zero initially. After the goalkeeper caught the puck the final velocity for both will be 0.053 m/s and the momentum of the puck and keeper are, 0.0085 and 6.36 kg m/s. The mass of the hockey puck is 0.16 Kg with a velocity of 40 m/s. So, the momentum = velocity × mass, = 40 m/s ×0.16 Kg, and = 6.4 Kg m/s. The initial momentum of the goalkeeper is zero because his velocity is zero. But after the goalkeeper catches the puck their velocity becomes equal. That's M1 U1 + M2U2 = (m1 + m2) V, 6.4 Kg m/s + 0 = (0.16 Kg + 120 Kg) v, and v = 6.4 Kg m/s / 120.16 kg = 0.053 m/s.
Now the final momentum of the puck is = 0.16 kg × 0.053m/s = 0.008 kg m/s. The momentum of the goalkeeper = 120 Kg × 0.053 m/s = 6.36 kg. So, the greater momentum is associated with the goal keeper after the puck is caught.
m/s.
16. Newton's cradle describes as an "almost-ideal" closed system because no forces was used on the balls, and they were just synchronization. Now Newton's cradle has five small balls hanging in a straight line attached with threads on two similar bars.
17. The mass is going to be m1 = m2 = 0.15 kg. The speed of it is that the u1 = 3 m/s and u2 = -2 m/s. The blue ball moving in the + axis. Green ball moving in the - axis. After collision, the final velocity of the blue ball be "v1". then, v2 = 0, and the momentum conversion is, → m1u1 + m2u2 = m1v1 → v1 = u1 + u2 (m1 = m2) → v1 = 3-2 → v1 = 1 m/s (This is the speed of green ball.)
18. By applying a braking force: A braking force causes the velocity to decrease with time. When a braking force is applied the frictional force exceeds the forward force hence the net force decreases.
By increasing the roughness of the road: When the roughness of the road is increased, the frictional force also increases causing the net force on the cart to decrease hence it decelerates.
19. Two will involve two billiard balls as the masses, m1 and m2, and the velocities u2 and u2. The two collide and the velocities of the balls after the collision v1 and v2 are marked. The momentum before and after the collision is calculated like m1u1 + m2u2 = m1v1 + m2v2. The momentum before and after collision in a system of colliding bodies is conserved. The momentum of a body is calculated using the formula and momentum that = mass and velocity. So, for the two billiard balls, the momentum before and after the collision is conserved.
Thanks for looking and using or not. I don't care, but thanks anyway. 100% percent with the multiple choice questions to Korra! Leave thumbs up or down, whatever you like.
no one has the answer?
Forgot to say the name of the test.
Physical Science A Unit 8 Lesson 12: Conservation of Momentum Unit Test