Pressure and Density

Question 1

Which orientation of the block below would create in a smaller pressure on a table?

Answer 1

First orientation

P = F/A

The second block has a larger area in contact with the table, for the same force, therefore, the pressure is lower

Question 2

What is a pascal?

Answer 2

1 Pascal = 1 Newton per metre square

Question 3

Explain what design feature makes a knife able to cut easily.

Answer 3

A sharp knife with a small surface area creates a greater pressure for the same force.

pressure = force/area

The knife will cut more easily

Question 4

What is the unit for force?

Answer 4

Newton or N

Question 5

Camels have adapted to walk effortlessly in the desert sand. Explain

Answer 5

Camels feet have a large surface area

P = F/A

A larger surface area for the same force results in lower pressure

The camel will not sink as much in the sand and can walk more easily.

Question 6

Which orientation of the block below would create a larger pressure on a table?

Answer 6

Second orientation

P = F/A

The second block has a smaller area in contact with the table for the same force, therefore, the pressure is higher

Question 7

What is the unit for pressure?

Answer 7

Pascal (Pa)

Question 8

How can mass be measured accurately?

Answer 8

• placed balance on level surface
• tare (zero) balance before use

Question 9

Fluid pressure acts in all directions.

What causes air pressure?

Answer 9

Air particles move in all directions and collide with objects

Air particles move fast and freely

Air pressure is related to the depth of air over the object.

Question 10

What is the unit for area?

Answer 10

m² or cm²

Question 11

What equation links pressure, force and area?

Answer 11