Quiz about IPC Module 3 Quiz

Question 1

What is the difference between static and sliding friction?

Accepted Answer

Static friction prevents two surfaces from sliding past each other, while sliding friction opposes the motion of two surfaces sliding past each other.

Answer

Sliding friction occurs on slippery surfaces while static friction is on rough surfaces.

Answer

Static friction and sliding friction are the same.

Answer

Static friction opposes the motion of two surfaces sliding past each other, while sliding friction prevents two surfaces from sliding past each other.

Question 2

Why does a crumpled-up paper fall faster than a flat sheet of paper?

Accepted Answer

The flat paper has more surface area and more air resistance.

Answer

The crumpled up paper has more gravitational force exerted upon it.

Answer

The flat paper has less mass than the crumpled up paper.

Answer

None of the above; the flat sheet will fall faster.

Question 3

Explain why objects do not fall at the same speed.

Accepted Answer

Objects have different masses and weights and air resistance affects them differently.

Answer

Objects fall from different heights, so they hit the ground at different times, even if they have the same mass.

Answer

Objects experience friction in the air, which slows them down.

Answer

None of the above; all objects fall at the same speed.

Question 4

What is the law of universal gravitation?

Accepted Answer

It states that the gravitational force between two objects increases as the mass of either object increases and as the objects move closer.

Answer

It states that anything in the range of something with a gravitational pull will be pulled toward that object.

Answer

The law of universal gravitation does not exist.

Answer

It states that everything is always acted upon by gravity.

Question 5

What is the mass of an object that has a force of 170 N and an acceleration of 17 m/s²?

Accepted Answer

10 kg

Answer

7 kg

Answer

1,700 kg

Answer

1.7 kg

Question 6

What is the difference between Newton's first and third law of motion?

Accepted Answer

The 1st law states that an object moves at a constant velocity unless an unbalanced force acts on it, while the 3rd law states that every force acted on an object will have an equal and opposite reaction.

Answer

The first law states that every force acted on an object will have an equal and opposite reaction, while the third law states that an object will move at a constant velocity unless an unbalanced force acts on it.

Answer

Both laws include freefall, so they are the same.

Answer

None of the above; the second law proves both of these laws wrong.

Question 7

Which term best describes the forces on an object with a net force of 0?

Accepted Answer

Balanced

Answer

Unbalanced

Question 8

When does an object experience terminal velocity?

Accepted Answer

When the force of air resistance equals the force of gravity. There is no more acceleration downwards and the object maintains constant speed.

Answer

When the object is at its highest point of acceleration while in free fall

Answer

When the object is the farthest away from the ground and the object's mass is equal to its weight.

Answer

When the object experiences no air resistance.

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