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Unit 04 - Forces and Momentum Test

Posljednje ažuriranje almost 4 years ago

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Pitanje 1

1.

A 2-kg object is moving horizontally with a speed of 4 m/s.
How much net force is required to keep the object moving at this speed and in this direction?

8 N

12 N

0 N

4 N

Pitanje 2

2.

In the helium balloon inside the car example, what was the conclusion the class reached as to why this did not violate the first law?
https://www.youtube.com/watch?v=XXpURFYgR2E

The air inside the car had a greater mass than the air in the balloon. This air moved as predicted by the first law. Since the air outside the balloon had less mass it forced the balloon with more mass to go in the opposite direction.

The air inside the car had a greater mass than the air inside the balloon. This air moved as predicted by the first law. Since the air outside the balloon had more mass it forced the balloon with less mass to go in the opposite direction.

The class decided that it did violate Netwon's First Law, because anything can violate a law of Physics.

The air inside the car had less mass than the air inside the balloon. This air moved as predicted by the first law. Since the air outside the balloon had less mass it forced the balloon with more mass to go in the opposite direction.

Pitanje 3

3.

What is the gravitational force of 1kg?

Pitanje 4

4.

A leftward force is applied to a dresser to accelerate it to the left across the bedroom floor. Ignore air resistance. (Grading on forces and magnitudes)

Pitanje 5

5.

Why does constant velocity indicate NO net force?

net forces are connected to velocity, not acceleration

constant velocity means that there is acceleration, and therefore means that there is no net force

constant velocity means no acceleration, and for there to be a net force there must be an acceleration

for something to be moving at a constant velocity means there must be a force acting upon it somewhere (Mr. Fischers Example of the Laptop Case)

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Pitanje 6

6.

What is the net force on the object?

4

Pitanje 7

7.

Explain what is happening to the object using the word 'acceleration'.

Pitanje 8

8.

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In the situation above, the force of letter D must be Newtons, and letter E must be pulling with a force of Newtons.

Pitanje 9

9.

A doubling of the mass results in a

Terminal velocity is when fgrav and net force become equal and then there ceases to be any fair on the object.

Terminal velocity is when fair becomes greater than fgrav and then the net force or acceleration on the object increases.

Terminal velocity is when fgrav and fair become equal and then there ceases to be any net force or acceleration on the object.

Terminal velocity is when net force and fair become equal and then there ceases to be any fgrav on the object.

Pitanje 12

12.

Give an example of a action-reaction pair.

Pitanje 13

13.

Determine the velocity of both the red and blue cart after the inelastic collision.