Chapter 13 Test: Pressure in Fluids

What is the formula to calculate pressure?

• Pressure = Force/Area

• Pressure = Area x Force

• Pressure = Mass x Velocity

• Pressure = Change in velocity/Total time

What is the unit of measure for pressure?

• Pascal

• Newton

• Meter

• m/s²

Answer explanation

Pressure is measured in Pascal (Pa), named after French scientist Blaise Pascal. It is equal to N/m².

True or False. As fluid depth increases, water pressure decreases.

• True

• False

Answer explanation

Water pressure increases as fluid depth increases.

What is the relationship between air pressure and altitude?

• There is no relationship.

• Air pressure increases as altitude increases.

• Air pressure decreases as altitude increases.

True or false. The pressure in a fluid at any given depth is constant, and it is exerted equally in all directions.

• True

• False

A 320-N ballet dancer is balanced on the toe of her shoe. If the toe has an area of 0.0010 m², what pressure does she exert on the floor?

• 320 Pa

• 3.2 Pa

• 320,000 Pa

• 32,000 Pa

Answer explanation

Use the pressure formula to solve.

320-N/0.0010 m² = 320,000 N/m² = 320,000 Pa

Define pressure.

• The product of an object's mass and its velocity.

• The measure of the inertia of an object.

• A measure of the force of gravity acting on an object.

• The result of a force distributed over an area.

True or False. Both liquids and gases are fluids.

• True.

• False.

Answer explanation

Because both liquids and gases can flow an take on the shape of their containers, both are fluids.

A circus performer on a pair of stilts exerts a pressure of 45 kPa on the ground. If the performer stands on one stilt, what pressure does the stilt exert on the ground?

• 22.5 kPa

• 60 kPa

• 90 kPa

• 45 kPa

Answer explanation

When the performer puts the same weight on one stilt, they double the pressure on the ground.

2 x 45 kPa = 90 kPa.

A change in pressure at any given point in a fluid is transmitted equally and unchanged in all directions throughout the fluid. This statement is known as ______________.

• Newton's First Law of Motion.

• Newton's Law of Universal Gravitation.

• Pascal's Principle

• Bernoulli's Principle

Answer explanation

Pascal's principle was discovered in the 1600s.