Force and Pressure (Chapter P11) Flashcards
What is pressure measured in
Pascal (Pa)
What is the equation for pressure
pressure = force / area
What happens to the pressure in a liquid as the depth increases
It increases
What is pressure in a liquid
Pressure = height x density of liquid x gfs
What causes pressure in the liquid
The liquid above pushing down and creating a force
What causes atmospheric pressure
Air molecules colliding with surfaces which exerts a force
What happens to atmospheric pressure as the altitude increases
It decreases as there is less air so less collisions
What happens to the density of the atmosphere with increasing altitude
Decreases
What is upthrust
It is the sum of the upward force on an object and the downward force of the object due to weight
What happens when an object’s upthrust is equal to its weight
It floats
What happens when an objects weight is greater than its upthrust
It sinks
