Which of the following describes an object with zero net force acting on it? Cho

Question

Which of the following describes an object with zero net force acting on it? Choose all that apply.

The car sped up from 50 mph to 65 mph while moving in a straight line. The truck slowed down while making a right turn. The moped accelerated while making a left turn. The spaceship traveled at a constant speed in a straight line. The motorcycle traveled at a constant speed while making a u-turn.

2. –/1 points

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My Notes If you observe that an object is accelerating, what should you conclude?

A net force is acting on it. Only forces cause acceleration. As such, if an object is accelerating it must be because a net force is acting on it. The forces acting on the object must be greater than the forces the object is exerting.     It must be changing direction. Acceleration is a vector and vectors have both magnitude and direction. Thus if an object is accelerating it must be changing direction. It must be speeding up. If an object is accelerating that means it is speeding up. It must be in free fall.

3. –/1 points

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My Notes Which of the following are true according to Newton's 2nd Law? Choose all that apply.

If the acceleration is zero, then the net force is zero. The larger the net force on an object is, the smaller the acceleration. The larger the net force on an object is, the larger the acceleration. If two objects have the same acceleration, the one with more mass will have a larger net force exerted on it. If two objects have the same acceleration, the one with less mass will have a larger net force exerted on it. If you apply the same force to 2 objects, the one with less mass will have a greater acceleration. If you apply the same force to 2 objects, the one with more mass will have a greater acceleration.

4. –/2 points

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My Notes A box is on the Moon. The box weighs 123 lb and is in free fall. How much force is the box exerting on the Moon and in what direction?

lb

West Left     South East North Right Up Down

5. –/1 points

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My Notes

Which of the following are the correct units for mass? Choose all that apply.

slugs u kg·m2/s2 dyn N tons kg lb

6. –/1 points

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My Notes

A gold brick is transported from Earth to the Moon. Which of the following statements is true?

Both the mass & the weight of the brick will change. The mass of the brick will change but the weight of the brick will remain the same.      Both the mass & the weight of the brick will remain the same. The mass of the brick will remain the same but the weight of the brick will change.

7. –/1 points

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My Notes

If an object is traveling in a circle, which of the following must be TRUE? Choose all that apply.

The object is speeding up. The object is slowing down. The object has a constant velocity. The object is accelerating. The object has a net force acting on it.

8. –/1 points

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My Notes

Why do astronauts on the Internation Space Station (ISS) experience weightlessness?

Because they are orbiting Earth and anything that is in orbit is in free fall. Because this past fiscal year they itemized their deductions and as a result were able to completely eliminate their weight.     Because the food on the ISS sucks. Because they have no mass in space. If there is no mass, there is no weight. Because there is no gravity in space. Since there is no gravity, they have no weight. Because of the tidal influence of the Moon.

9. –/2 points

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My Notes

Because there's more rain on that side of Earth. The increased rainfall causes high tides. Because Earth is spinning on its axis and causing the water to bulge out due to the centrifugal force. Hence, there is a high tide.     The water on that side is closer to the Moon than Earth is. Thus, the water is being pulled away from Earth and creating a high tide. Due to the configuration of the Moon and Earth, the water is actually repelled by Earth's surface. Consequently, there is a high tide.

Why does the side of Earth furthest from the Moon experience a high tide?

Due to the configuration of the Moon and Earth, the water is actually repelled by Earth's surface. Consequently, there is a high tide. That side of Earth is closer to the Moon than the water is. Thus, Earth is being pulled away from the water and creating a high tide.     Because there's more rain on the top of Earth and it all flows downward to the sides. These tidal currents cause high tides. Because Earth is spinning on its axis and causing the water to bulge out due to the centrifugal force. Hence, there is a high tide.

10. –/1 points

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My Notes

A closed system is observed to have 54 objects in it. Initially, the total energy of the system is 6262 J. After 4.7 h have passed, how much total energy will the system contain?
J

11. –/1 points

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My Notes

Which of the following are the correct units for energy? Choose all that apply.

kg·m/s2 W cal J·s kg·m/s J kg·m2/s2 J/s

12. –/2 points

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My Notes

The total momentum of a closed system is observed to be 883 kgm/s east. The system consists of 24 objects that are observed to be colliding with each other. After 10.5 min and 9886 collisions, what is the total momentum of the system?
kgm/s

south backwards     east down up forwards north right left west

13. –/1 points

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My Notes

If an object is moving, which of the following must be TRUE? Choose all that apply.

The object has KE. The object has PE. The object has a net force acting on it. The object has a constant velocity. The object is accelerating. The object has momentum.

14. –/1 points

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My Notes

If a figure skating is spinning around with her arms outstretched, why will she spin faster if she brings her arms in?

By bringing in her arms she is reducing the air drag on her and hence, she spins faster. Momentum is always conserved. By bringing her arms in she is decreasing her mass. With less mass, in order to keep her momentum constant she must spin faster.     Angular momentum is always conserved. By bringing her arms in she is decreasing her radius. In order to keep her angular momentum from changing, she must spin faster. Energy is always conserved. By bringing her arms in she is decreasing her PE. To keep her total energy constant her KE must increase. Hence, she spins faster.

15. –/3 points

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My Notes

D C     B A

b.) Which force will create the most torque?

C A     B D

c.) Which forces will not create any torque? Choose all that apply.

A B C D

Question Part Points Submissions Used Moon Earth High tide Low tide

Explanation / Answer

1.  The spaceship traveled at a constant speed in a straight line.

2.  A net force is acting on it. Only forces cause acceleration. As such, if an object is accelerating it must be because a net force is acting on it

3. If the acceleration is zero, then the net force is zero.
The larger the net force on an object is, the larger the acceleration.
If two objects have the same acceleration, the one with more mass will have a larger net force exerted on it.
If you apply the same force to 2 objects, the one with less mass will have a greater acceleration.

4. 123 Lb in upward direction   

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