Brunelli's Principle

Diagram 9 shows two similar ping-pong balls suspended on strings of the same length. Which of the following diagrams shows the condition of the ping-pong balls when air is blown between them?

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Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-5

A ball which is thrown forward in a spin moves in a curve, as shown in the diagram. The curved path taken by the ball is due to

• equilibrium of forces

• Bernoulli’s principle

• Archimedes’ principle

• principle of conservation of momentum

Diagram 11 shows the roof of a house being lifted by strong winds. Which explains the above phenomenon?

• Pascal’s Principle

• Bernoulli’s Principle

• Archimedes’ Principle

• Newton’s First Law

Which apparatus uses Bernoulli’s principle?

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Diagram 13 shows an object with an aerofoil shape placed in a wind tunnel. Which position, A, B, C or D, experiences the lowest pressure?

• A

• B

• C

• D

Diagram 9 shows a piece of paper clamped to a retort stand. When air at high velocity is blown on top of the paper, the edge of the paper

• will lift up

• will move down

• does not move

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Diagram 12 shows a student blows strongly between two candle flames. Why the candle flames approach one another when being blown?

• Temperature between the candle flames becomes low

• Pressure between the candle flames become low

• Exist a vacuum area between the candle flames

• Hot air at the bottom of the candles rises

Tags

NGSS.MS-PS2-2

Diagram 10 shows a boy blowing over a glass rod. Which principle explains the situation?

• Pascal’s Principle

• Bernoulli’s Principle

• Archimedes’ Principle

• Principle of conservation of momentum

Diagram 11 shows an aerofoil attached to the back of Formula One car. Which statement is correct when the car is moving fast?

• Pressure at X is lower than at Y

• Pressure at X and Y is the same

• Velocity at X and Y is the same

• Velocity at Y is greater than at X

Diagram 13 shows a top view of a sailboat against the direction of wind. Which direction A, B, C or D, the lift force acting on the sail?

• A

• B

• C

• D