Chapter 4 - Forces

Question 1

Equation for pressure

Answer 1

P = f/a

Question 2

Equation for pressure when submerging items

Answer 2

p = h ρ g

Question 3

How is the pressure for submerging items derived?

Answer 3

Pressure = force or weight / area 
Weight = mass * g
Mass = ρV * g
V = h * A 

Hence : 
Pressure = ρ * h * A * g 
                  -----------------
                         A
As A cancels out:
pressure = ρ h g

Question 4

Pressure and height relationship

Answer 4

Directly Proportional

Question 5

How to find the pressure on a submarine?

Answer 5

It would be the atmospheric pressure and the pressure by the water.

Question 6

Upthrust equation

Answer 6

u = x ρ g A

x- the height of the object.

Question 7

Archimedes’ Principle

Answer 7

The upthrust exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces.