Pressure, Hydraulics, and Pneumatics

Flashcards about pressure, hydraulics, and pneumatics notes

What is pressure?

Force acting over a certain area.

What is force measured in?

Newtons (N).

What is pressure measured in?

N/m² or Pascal (Pa).

What happens when you change the area and keep the force the same?

The pressure changes.

Who was Blaise Pascal?

French scientist that studied fluids and pressure.

What is Pascal's Law?

Pressure applied to an enclosed fluid is transmitted undiminished in all directions throughout the fluid and perpendicular to the walls of the container.

What is a hydraulic lift?

A mechanical system that raises heavy objects, using a fluid under pressure in a closed system.

Why do hydraulic systems have a large Mechanical Advantage?

The fluid transmits pressure equally.

What do hydraulic systems use?

Hydraulic systems use the force of a liquid in a confined space.

What are two essential characteristics of fluids applied by Hydraulic systems?

Incompressibility and ability to transmit pressure.

What hydraulic system does your body depend on?

The circulatory system.

What is a pneumatic system?

A system that does not seal the gas in the same way as hydraulic systems seal in the fluid it uses.

What pneumatic system does life depend on in your body?

The respiratory system.

What allows air to enter and leave the body as they contract and expand?

Lungs.

What is a subsystem?

A simple machine that is part of a larger system

What subsystems are in a car?

Steering wheel and axle, seat belt pulley, gear shift lever, brakes wedge, engine screws.