What is the main goal of Mark Rober's science class?

• To memorize facts

• To prepare for exams

• To complete homework assignments

• To update mental models of the world

What is density defined as?

• How much you weigh relative to how much space you take up

• The weight of an object

• The amount of space you take up

• The volume of an object

What happens if an object is less dense than the fluid it is in?

• It evaporates

• It sinks

• It floats

• It dissolves

Why do cruise ships, which are made of steel, float?

• They are less dense than water due to the air inside

• They have special coatings

• They are powered by engines

• They are designed to be lightweight

What is the purpose of a life jacket?

• To increase your weight

• To make you less dense and help you float

• To decrease your volume

• To keep you warm

What is the buoyancy force?

• The force that acts horizontally on objects

• The force that keeps objects stationary

• The force that pushes objects up in a fluid

• The force that pulls objects down

Why does a helium balloon rise in the air?

• It is less dense than the surrounding air

• It is pushed by the wind

• It has a special coating

• It is heavier than air

What is the grade school answer to whether farting makes you weigh less?

• Farting makes you weigh more

• Farting makes you weigh less

• Farting has no effect on your weight

• Farting makes you float

What challenge does Mark Rober give to the viewers?

• To conduct a chemical experiment

• To write an essay

• To memorize the lesson

• To make something neutrally buoyant

What advice does Mark Rober give about facing challenges?

• Ignore feedback from others

• Treat challenges like video games and focus on beating them

• Avoid challenges to prevent failure

• Only take on easy challenges