P11 - Force & Pressure 2️⃣✅

Question 1

What is pressure?

Answer 1

The force per unit area

Question 2

What is the unit of pressure?

Answer 2

Pa, Pascals

Question 3

What is the equation for pressure?

Answer 3

Pressure (Pa) = force (N) / Area (m2)
P = f/a

Question 4

What is the equation for weight/force(N)?

Answer 4

Force (N) = mass (kg) x gravity (9.8)
F = m x g

Question 5

What is the symbol for pressure?

Answer 5

The letter ‘p’

Question 6

What is the symbol for liquid density?

Answer 6

The Greek letter rho ‘ρ’

Question 7

What is the equation for density?

Answer 7

Density = mass (kg) / volume (cm3)
ρ = m/v

Question 8

What is the equation for liquid pressure?

Answer 8

Pressure (Pa) = (liquid) density (kg/m3) x gravity (N) x height (m)
P = ρ x g x h

Question 9

The smaller the pressure the __________ the area

Answer 9

bigger

Question 10

The greater the pressure the ___________ the area

Answer 10

smaller

Question 11

1 kilonewton = ?N

Answer 11

1000N

Question 12

How do you get from kilonewtons to newtons?

Answer 12

X by 1000

Question 13

How do you get from newtons to kilonewtons?

Answer 13

divide by 1000

Question 14

1 kilopascal= ?Pa

Answer 14

1000Pa

Question 15

How do you get from kilopascals to pascals?

Answer 15

X by 1000

Question 16

How do you get from pascals to kilopascals?

Answer 16

divide by 1000

Question 17

What is atmospheric pressure?

Answer 17

air molecules colliding with surfaces - every time they hit a surface they exert a small force, but because it happens so frequently & there are so many collisions it eventually equals air pressure (like a net force)

Question 18

What is upthrust?

Answer 18

An upwards force on a body in a fluid

Question 19

What is Archimedes principle?

Answer 19

The size of upthrust is equal to the weight of the fluid that has been displaced
e.g. upthrust = weight of fluid displaced

Question 20

If an object has a density less than the fluid its in it ______?

Answer 20

floats

Question 21

If an object has a density the same as the fluid it __________

Answer 21

suspends e.g floats in the liquid but is submerged

Question 22

If an objects has a density greater than the fluid its in it ______?

Answer 22

sinks

Question 23

What is a fluid?

Answer 23

A substance that can flow (liquid or a gas)

Question 24

What is the unit for area in the pressure equation?

Answer 24

m2

Question 25

What is the unit for density?

Answer 25

g/cm3 or kg/m3

Question 26

Atmospheric pressure ____________ with an increase in height.

Answer 26

Atmospheric pressure decreases with an increase in height.

Question 27

As depth increases pressure ________________

Answer 27

As depth increases pressure also increases

Question 28

Why is pressure greater when deeper?

Answer 28

Because as you go further down their is a greater weight of waster pushing down therefore a higher pressure