Pascal's Principle

The amount of force pushing on an area is the definition of....

• Fluid
• Viscosity
• Barometer
• Pressure

Pressure can be measured in Pascals (Pa) or Newtons per square meter.

1 Pa = 1N/m²

• True

• False

A force is applied in a closed container, the pressure increases the same amount. EX: squeezing a water bottle or toothpaste

• Archimede's Principle
• Pascal's Principle
• Bernoulli's Principle 

What is the pressure in the hydraulic fluid?

• 1210 N
• 484 N/m²
• 8000 N
• 3025 N/m²

Fluids can be...

• solids
• liquids
• gases
• liquids or gases

Which statement correctly describes pressure?

• the applied force that acts on an object

• force per unit area

• the area to which a force is applied

• force times surface area

As the area a force acts on increases, the force exerted on each unit of area

• increases

• decreases

• remains constant

What is the greatest benefit of using hydraulics?

• The multiplication of speed

• The multiplication of operating time

• The multiplication of fuel efficiency

• The multiplication of force

The largest barometer ever built was an oil-filled barometer constructed in Leicester, England in 1991.  At an atmospheric pressure of  $1.013\ \times\ 10^5$  Pa, height of the oil column was 12.2 m.
What was the density of the oil used in the barometer?

• 330.33 $kgm^{-3}$  

• 846.40 $kgm^{-3}$  

• 830.32  $kgm^{-3}$  

• 231.03  $kgm^{-3}$  

In a car lift, compressed air exerts a force, F₁ on a small piston having a radius of 5.5 cm. This pressure is transmitted to a second piston of radius 20 cm as shown in figure above. The mass of the car is 1250 kg.

Calculate the pressure on the smaller piston F_1.

• 6.25 kPa

• 61.31 kPa

• 97.57 kPa

• 306.56 kPa