P1.3.5 - Floating And Sinking Flashcards
1
Q
Why is there an upwards force on a floating object?
A
In order to balance its weight
It’s called upthrust.
2
Q
What is the equation for pressure?
A
Pressure (Pa) =
Force (N)
—————
Area (m^2)
3
Q
If an object floats…
A
Pressure at the bottom times the area at the bottom
Minus
Pressure at the top times the area at the top
=
Weight
4
Q
Why do some objects float and others sink?
A
If the pressure difference together with the area is big enough then the upthrust will be large enough to balance the weight
