Impulse / Momentum
Conservation of Momentum
Recoil
Physics Trivia
Chapter 9 Conceptual
100
Impulse is defined by which equations?
I = Delta P I = Fnet * time
100
What is a closed system?
A system where mass is conserved
100
Which law of Newton explains recoil?
Third Law
100
Due to thermal expansion, this famous French tower is 15 cm taller in the summer.
Eiffel Tower
100
Define momentum.
Sample Answer: A measurement of how hard it is to stop a moving object.
200
A ball collides with a ball with twice its mass. The impulse the first ball gives to the second ball is ______ to the impulse the second ball gives to the first ball.
Equal to
200
What is an isolated system and give an example.
System with no external forces. EX: 2 balls in space
200
An astronaut tosses a wrench away from himself at a non-zero velocity in space. The momentums of the astronaut and the wrench are _______ and _______.
Equal and Opposite
200
If an atom was the size of a stadium, the electrons would be the size of: a) bees b) soccer balls c) average person
Bees
200
The area underneath a force vs. time graph represents:
Impulse
300
A basketball is being dribbled by a student. At what point is the velocity of the basketball zero? a) Before ball hits the ground. b) During the ball's contact with the ground. c) Right after the ball loses contact with the ground.
During
300
When is momentum conserved?
When a system is both closed and isolated.
300
You are sitting on a frozen lake and want to get back to shore. How do you get back to shore with only 2 pairs of heavy boots?
By tossing the boots you'll give yourself a change in momentum so you can travel back to shore.
300
Why is momentum symbolized by a p?
It came from the Latin petere (push or pull)
300
A ball of velocity V rebounds against the wall with a velocity of -V. Was momentum conserved? Why or why not?
Was not conserved because system was not isolated.
400
Calculate the force exerted on a 10 kg object moving at 15 m/s to stop it in 0.5 seconds.
300 N
400
A 10 kg ball moving at 5 m/s collides with a stationary ball of unknown mass. Afterward the 10 kg ball stops moving completely. What is the mass of the second ball if it starts moving at 15 m/s right after the collision?
3.33 kg.
400
Emily whose mass is 150kg finally achieved her dream of being an astronaut. During her first trip to the ISS she got stranded outside with just an oxygen tank. Because she learned so much in physics class she throws her 50 kg tank away from herself at a velocity of 10 m/s to push herself towards the ISS. How far away was she if it took her 20 seconds to get back to the ISS?
66.7 meters.
400
Why is it so easy to float on the Dead Sea?
The high salt content.
400
A car crash with a loss of mass and deformation would not be a case of conservation of momentum because?
It is not a closed system.
500
A water balloon is dropped from a height of 15 meters. Find the mass of the balloon if it experienced a force of 1500 N in 0.1 seconds to stop it completely.
8.7 kg
500
A car weighing 18,500 N is traveling west at a velocity of 15 m/s when it collides with a truck weighing 28,500 N going east a velocity of 5 m/s. They then travel together. Find the direction and magnitude of their new velocity after the crash.
2.87 m/s West
500
Garrett weighs 500 N and is on the far end of a 10 meter long boat of mass 500 kg. He then jumps forward at a velocity of 5 m/s, pushing the boat backward in the process, and landing on the opposite end of the boat. How long does it takes him to land on the other side of the boat?
1.8 seconds
500
What did Albert Einstein receive a Nobel Prize for?
Photoelectric effect
500
Mr. Phan has two identical balls in his hand. He tosses one to the right with a speed of 10 m/s. He then toss the other one to the left with a speed of 10 m/s. Do the two balls have the same momentum? Why or why not?
Momentum is a vector. Therefore, even though they have the same magnitude, the direction and sign of their momentum are not the same.
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