science G8 Ch 9

Pneumatics is concerned with a system that uses:

• Oil

• Expanded air

• Compressed air

• Electricity

What is a valve?

• A mechanical device or part that moves a fluid through or into something.

• A system that allows a fluid to move quickly.

• A mechanical fluid system that releases pressure.

• A mechanical device or part that controls the flow of fluids.

A boy weighing 65kgf wear a shoes of area 10cm² , and a girl weighing 40 kgf wears sandals with heel of area 2 cm² . compare the pressure exerted.

• 13 : 4

• 13 : 40

• 65 : 20

• 6.5 : 2.0

What parts of fluid systems are also found in the human body?

• Valves.

• Compressible and incompressible fluids.

• Pumps.

• Pistons.

To calculate pressure you need to know ...

• Force & Volume

• Density & Volume

• Power & Area

• Force & Area

When area increases...

• pressure increases

• pressure decreases

• pressure stays the same

• pressure increases then decreases

What is a pump?

• A fluid system that allows pressure to be applied to another object.

• Compressed air that pushes out pressure from an object.

• A mechanical device or part that is used to move a fluid through or into something.

• A mechanical device that does not move a fluid.

which one is an example of Pascal's law?

• A bathtub overflows with water when you leave the faucet running too long.

• Toothpaste moves throughout the tube when you squeeze it with the cap still on.

• Warm are from a hair dryer blows through your hair.

• All of the above.

The SI Unit for pressure is

• N

• kg/cm³

• psi

• Pa

Respiration is possible due to?

• Liquid pressure

• Atmospheric pressure

• Hydraulic pressure

• All