Summary of Pressure

Question 1

What is Boyle’s Law?

Answer 1

The volume of a given amount of gas held at constant temperature is inversely proportional to the pressure under which it is measured.

Question 2

Pressure to Temperature

Answer 2

Directly proportional

Question 3

Pressure to volume

Answer 3

Inversely proportional

Question 4

Pressure to Surface Arra

Answer 4

Inversely proportional

Question 5

Pressure to force

Answer 5

Directly proportional

Question 6

Pressure to Height

Answer 6

Inversely proportional

Question 7

There is more pressure at greater _______ in liquids and in denser materials.

Answer 7

Depths

Question 8

In a container with multiple opening with the same depth, where is pressure the greater?

Answer 8

The pressure is the same throughout

Question 9

The pressure at a given depth is ______ of direction because it is the same in all ______.

Answer 9

Independent

Directions

Question 10

When we measure the pressure of _____, like that of the air in car tyres, we usually make this measurement relative to normal ____ pressure. That is we calculate the difference between the pressure in the tyre and the pressure exerted by _____. Liquids can also be measured against normal air pressure.

Answer 10

Gases
Air
Atmosphere

Question 11

Why do objects want to float when put into deep water?

Answer 11

There is more pressure at the bottom of an object because pressure increases with depth. This difference in pressure results in an upward buoyant force on the object.

Question 12

What is buoyancy?

Answer 12

An upward force exerted by a fluid that opposes the weight of an immersed object

Question 13

When will an object in a fluid sink?

Answer 13

If the object’s weight is greater than the buoyant force

Question 14

When will an object in a fluid float?

Answer 14

An object floats if the buoyant force on the object is equal to the object’s weight.

Question 15

When the diver is at the bottom, what happens to the buoyancy and the air bubble?

Answer 15

Small buoyancy and the air will compress when squeezed hard.

Question 16

When the diver is at the top of the bottle, what happens to the air bubble and the buoyancy?

Answer 16

Air bubble will expand when not squeezed and large buoyancy.

Question 17

Why does a submarine float?

Answer 17

Because the pressure within its tanks are equal with the water pressure. Buoyant force is equal to weight.

Question 18

Why does the submarine sink?

Answer 18

Air escapes from its tanks as water fills the tanks. Adds weight to the submarine. Weight is less than buoyant force.

Question 19

Why does a submarine float?

Answer 19

Compressed air is released into the tanks and water is forced out. Buoyant force is greater than weight.

Question 20

What is Pascal’s principle?

Answer 20

A pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

Question 21

Hydraulics make it easier to lift _____ objects

Answer 21

Heavy

Question 22

By applying a small force on piston 1 is it possible to exert a large force at piston 2?

Answer 22

Liquids almost incompressible and so they distribute pressure applied to them in all directions.

Question 23

How are dam walls built?

Answer 23

Dam walls are built so that it can support the increasing hydrostatic pressure with depth. So it is fatter and the bottom.