Unit 2 Review

Front

What is buoyancy?

Back

Buoyancy is the ability or tendency to float in air, water, or another fluid.

Front

What is the purpose of the burner in a hot air balloon?

Back

The burner heats the air inside the balloon for lift.

Front

What is a glider?

Back

A glider is an aircraft whose flight does not depend principally on an engine.

Front

True or False: The buoyant force on a submerged object is equal to the weight of the fluid displaced by the object.

Back

True.

Front

What inspiration did Greek myths provide to modern civilization?

Back

Greek myths inspired the concept of human flight.

Front

Define gravity.

Back

Gravity is the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

Front

What is viscosity?

Back

Viscosity is a measure of a fluid's resistance to flow.

Front

What is density?

Back

Density is the mass per unit volume of a substance.

Front

How does a hot air balloon achieve lift?

Back

A hot air balloon achieves lift by heating the air inside the balloon, which decreases its density compared to the cooler air outside.

Front

What is the principle of Archimedes?

Back

The principle of Archimedes states that a body immersed in a fluid experiences a buoyant force equal to the weight of the fluid displaced.