Science exam answers Lesson 8

What is meant by pressure in the scientific sense?

What units are used to measure pressure?

Pressure is the force applied to unit of surface area. It

is measured in Pascals (PA) (N/m^2).

In your own words, describe atmospheric pressure

and water pressure.

Atmospheric pressure is the force the atmosphere

(gas) exerts on a unit of surface area.

Water pressure is the force the water (liquid) exerts on

a unit of surface area.

Describe Pascal’s Law in your own words. Draw a

diagram to illustrate the law.

Pascal’s Law states that a force applied to a fluid is

distributed equally to all parts of the fluid.

The formula for this law is Force = Pressure x Area

How is Pascal’s Law applied in hydraulic lifts, which

are able to lift a heavy car with minimal input force?

We push Piston A:

- farther

And Piston B rises:

- with more force

- not as far

a) You can increase the force by increasing the surface

area (force multiplier).