How does blowing affect the movement of the ball?
When you blow through the funnel, a current of fast moving air is created around and above the ball. This results in a low-pressure zone below the ball relative to its surroundings. The higher pressure air surrounding the funnel pushes the ball down and keeps it from rising any farther.
What does Bernoulli’s principle explain?
Explain that the Bernoulli Principle states that slower moving fluids create greater pressure (force) than faster moving fluids. Tell the students that air is a fluid because it flows and can change its shape.
What happens to the balloon flow of air?
The collision of these air particles with the walls creates a high-pressure environment inside the balloon relative to the atmospheric pressure around it. This is why when a balloon is released, the high-pressure air flows out of the balloon to the low-pressure air surrounding it: “Winds blow from high to low.”
What is steady flow?
A steady flow is one in which all conditions at any point in a stream remain constant with respect to time. Pressure also fluctuate at every point. But if this rate of change of pressure and velocity are equal on both sides of a constant average value, the flow is steady flow.
How does a ping pong ball float in air?
This is due to gravity. The ball “floats” in the air at an even point when the force of gravity (which is forcing the ping pong ball down) is equal to the force of the air stream from the hair dryer (which is pushing the ping pong ball up). This is known as Bernoulli’s Principle.
How does the Bernoulli effect explain lift of an airplane?
Bernoulli’s principle helps explain that an aircraft can achieve lift because of the shape of its wings. They are shaped so that that air flows faster over the top of the wing and slower underneath. The high air pressure underneath the wings will therefore push the aircraft up through the lower air pressure.
What is the law of lift?
According to Newton’s third law, the air must exert an equal and opposite (upward) force on the airfoil, which is lift. Then Newton’s third law requires the air to exert an upward force on the airfoil; thus a reaction force, lift, is generated opposite to the directional change.
What is the end of a balloon called?
Typically, this results in a circular, eraser-sized thickening at the top end of the balloon, called its drip point. The latex of a balloon’s drip point can, in some instances, be thick enough to be pierced without popping the balloon.