Bernoulli's principle: When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
A) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face.
B) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face.
C) the air above the upper face of the paper moves faster but the pressure remains constant.
D) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.
E) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face.

Question

Quizplus · Accepted Answer

Bernoulli's principle states that as the velocity of a fluid (in this case, air) increases, the pressure it exerts decreases. Therefore, when you blow air over the top of a paper strip, the air moves faster over the top surface than the bottom, resulting in a lower pressure above the paper than below. This pressure differential causes the paper to rise. Choice B correctly describes these principles.

Bernoulli's Principle: When You Blow Some Air Above the Upper