Lesson 38 Practice Quiz

Quiz
•
Physics
•
9th Grade
•
Hard
Ravi Sawh
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for calculating impulse in a collision?
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes the principle of momentum conservation?
Momentum is always lost in a collision.
Momentum is conserved only in elastic collisions.
The total momentum of a closed system remains constant if no external forces act on it.
Momentum is conserved only in inelastic collisions.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary principle behind rocket propulsion?
Conservation of energy
Newton's first law of motion
Conservation of momentum
Gravitational force
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the impulse experienced by an object if a force of 10 N is applied for 5 seconds.
50 Ns
15 Ns
5 Ns
25 Ns
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 2 kg object moving at 3 m/s collides with a stationary 1 kg object. If the collision is perfectly elastic, what is the velocity of the 2 kg object after the collision?
1 m/s
2 m/s
3 m/s
0 m/s
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain how the impulse-momentum theorem is applied in car safety features like airbags.
Airbags increase the time over which the force acts, reducing the force experienced by passengers.
Airbags decrease the time over which the force acts, increasing the force experienced by passengers.
Airbags do not affect the impulse experienced by passengers.
Airbags increase the momentum of the passengers.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A rocket expels gas at a velocity of 2000 m/s. If the mass of the expelled gas is 5 kg, what is the change in momentum of the rocket?
10000 kg·m/s
4000 kg·m/s
2000 kg·m/s
5000 kg·m/s
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