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Inertia And Momentum
Test Description: Answer the review questions about inertia and momentum.
Instructions: Answer all questions to get your test result.
1) Why is Newton's first law correct even though real-world objects tend to eventually stop moving instead of remaining in motion?
A
Most objects are affected by unbalanced forces such as friction.
B
Newton's first law does not take inertia into account.
C
Newton's first law only applies to objects that are not already in motion.
D
Newton's first law does not apply in the real world.
2) Which of the following situations best illustrates Newton's first law?
A
A lamp continues to sit at rest on a table if there is no net force on it.
B
Friction acts on objects in motion and at rest.
C
Momentum= mass X velocity
D
When you push on a wall, the wall pushes back on you with an equal and opposite force.
3) Momentum is best defined as
A
velocity divided by mass
B
mass divided by velocity.
C
final velocity minus initial velocity divided by change in time.
D
mass multiplied by velocity.
4) Which of the following statements about momentum is always true?
A
As the mass of an object increases its momentum always increases.
B
As the velocity of an object increases its momentum increases.
C
Inertia and momentum are the same for all objects in motion.
D
Objects in motion do not have momentum.
5) A 0.25 kg ball is rolled across the floor with a velocity of 3.5 m/s. What is the ball's momentum?
A
0.875 kg×m/s
B
0.071 kg×m/s
C
14 kg×m/s
D
1.650 kg×m/s
6) The manufacturer of a bulletproof vest wants the vest to be able to stop a bullet with a mass of 0.4 kg and a velocity 1800 m/s. What is the momentum?
A
720 kg×m/s
B
820 kg×m/s
C
740 kg×m/s
D
4500 kg×m/s
7) A car is traveling with a velocity of 35.4 m/s. The mass of the car is 2000 kg. What is the momentum of the car?
A
65.5 kg×m/s
B
78,000 kg×m/s
C
70,800 kg×m/s
D
56.5 kg×m/s
8) A 0.145 kg baseball is thrown with a velocity of 40 m/s. What is the baseball's momentum?
A
5.8 kg×m/s
B
3.8 kg×m/s
C
5.2 kg×m/s
D
4.0 kg×m/s
9) Joan has a physics problem to solve. The mass is 50kg and the velocity is 2 m/s. Her answer is 10 kgxm/s. Is her answer correct?
A
Yes, it is correct.
B
No, her answer is ten times bigger than it should be,
C
No. her answer is ten times too small.
D
No, her answer is twice as big as it should be.
10) Esme's 0.28 kg ball rolls at 1.4 m/s. Danielle's ball has the same mass but a velocity of 2.3 m/s. Which ball has the most momentum?
A
Esme's ball
B
Neither ball had the most momentum
C
They are the same
D
Danielle's ball
*select an answer for all questions
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