P10 Pressure in liquids and gases

Question 1

what is one newton per square metre equal to?

Answer 1

one pascal

Question 2

what is a fluid?

Answer 2

substance that can flow
(liquid or gas)

Question 3

what is unit of pressure?

Answer 3

pascals (Pa)

Question 4

why does pressure in liquid increase with depth?

Answer 4

weight of liquid above that point

Question 5

what is upthrust?

Answer 5

resultannt force due to difference in pressure between the top and bottom surfaces of an object

Question 6

what will an object do if its weight is equal to upthrust?
(in a fluid)

Answer 6

float

Question 7

what will an object do if its weight is greater than upthrust?
(in a fluid)

Answer 7

sink

Question 8

what is earth’s atmosphere?

Answer 8

layer of air that surrounds earth

Question 9

what is atmospheric pressure caused by?

Answer 9

air molecules colliding with surfaces

Question 10

why does atmospheric pressure decrease with increased altitude?

Answer 10

density of air decreases (fewer air molecules)
ergo density of atmosphere decreases