P11 Flashcards
What is the pressure equation?
force(F) divided by area(A)
What is the unit of pressure
pascal(Pa)
What is 1 pascal equal to
1N/m squared
What happens to the pressure in a linguist when it increases depth?
It increases
What happens whilst the pressure along the same horizontal level is constant?
The liquid flows
What happens to the pressure in a liguid if the density increases?
It increases
How do air molecules create pressure on surfaces?
By colliding with them
Why does atmospheric pressure decreases with higher altitude?
because there is less air above a given altitude than their is at a lower altitude
What does the force on a flat object due to a pressure difference equal?
The pressure difference X the area of the flat surface
What type of force is the upthrust of an object in a fluid?
An upward force
What causes the upthrust in an object in a fluid?
The pressure of the fluid
When does an object sink when it’s fully immersed?
When it’s weight is greater than the upthrust on it
How is pressure created on surfaces?
By air molecules colliding with them
What is the pressure equation with units?
Pressure(Pa)= height(m) X density(kg/ cubic m) X gravity( N/kg
Why does atmospheric pressure decrease with higher altitude?
Because there is less air above a given altitude than there is at a lower altitude
