Lift

Front

What is lift?

Back

Lift is the force that directly opposes the weight of an object and holds the object in the air.

Front

What causes hot air to rise in a hot air balloon?

Back

Hot air is less dense than cool air, causing it to rise.

Front

What is the Bernoulli Effect?

Back

The Bernoulli Effect explains how an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.

Front

Why do we repeat tests in experiments?

Back

Repeating tests makes the results reliable, helping to spot chance anomalies.

Front

What happens when lift equals weight?

Back

The object remains at a constant altitude.

Front

What happens when lift is greater than weight?

Back

The object rises.

Front

What happens when lift is less than weight?

Back

The object falls.

Front

What are the two main forces acting on an airplane in level flight?

Back

Lift and weight.

Front

What are thrust and drag?

Back

Thrust is the forward force produced by engines, while drag is the resistance force acting opposite to thrust.

Front

What is the relationship between thrust and drag in level flight?

Back

In level flight, thrust must equal drag.