Science exam answers Lesson 7

How does the video demonstrate the idea that pressure

applied to a fluid is distributed equally in all directions?

When the piston of a syringe is pushed down, water

squirts out uniformly in all directions from the holes in

the flask.

Identify two applications of hydraulics. Explain how

Pascal’s Law is demonstrated in each one.

A hydraulic system is one that uses the pressure of a

liquid to perform mechanical work. A spreader can open

a car door by using hydraulic pressure. The pressure

from the origin point (beginning) is spread equally to the

2 ends of the spreader. The cutter (Jaws of Life) can cut

open a car door. The pressure from the origin point

(beginning) is spread equally to the 2 ends of the cutter.

Identify two applications of pneumatics. Explain how

Pascal’s Law is demonstrated in each one.

A pneumatic system is one that uses the pressure of a

gas to perform mechanical work. In a jack hammer

(pneumatic drill) the force of the compressed air drives

down the piston. The piston hits the chisel like tool.

That chisel hits the cement/pavement.

A dentist’s drill uses pneumatics. Air flows into an air

inlet tube. This air turns the turbine blades. This cause

the drill bit to turn very quickly.

Congratulations!

You have finished Lesson 7!