IPC Module 3 Quiz

What is the difference between static and sliding friction?

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

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

• Static friction and sliding friction are the same.

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

According to Newton's First Law of Motion, an object that is at rest ________________.

What is a force?

Answer explanation

A push or a pull.

Tags

NGSS.MS-PS2-1

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

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

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

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

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

What force would you need to balance a downward force of 120 N?

Explain how the forces are balanced for a cup resting on a table.

Answer explanation

The force of gravity holds the cup down on the table. The table exerts the same amount of force back onto the cup (but in the opposite direction)

The forces are balanced for a cup resting on a table. Which of Newton's Laws describes this situation?

Explain why objects do not fall at the same speed.

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

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

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

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

Tags

NGSS.MS-PS2-4

The weight of an object is 18 N on Earth. What is its weight on the moon (g_moon = 1.6m/s²)?

Answer explanation

m = F_Earth/g_Earth

m = (18)/(9.8) = 1.84 kg

F_moon = mg_moon = (1.84)(1.6) = 2.94 N

Tags

NGSS.MS-PS2-4

_____________ measures an object’s tendency to resist changing its motion.