Physics 4 (Yr 8)
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What happens to an object when it’s weight is less than the upthrust?
It floats
Which states of matter are fluids?
Liquids and Gases
What is a fluid?
A substance that can flow
What happens to an object when it’s weight is greater than the upthrust?
It sinks
What causes the pressure of a liquid in a container?
The particles hitting the sides of the container
As an object goes deeper into water, why does the pressure increase?
There is a greater weight of water pressing on the surfaces of the object
What is the relationship between depth of water and pressure?
As the depth of the water increases, the pressure increases
What is the name of the force caused by an object pushing down on a liquid?
Upthrust
What is the atmosphere?
A thin layer of gases around the Earth
Why does air pressure increase as an object moves lower down in the atmosphere?
Because there is a greater weight of air pressing on the surfaces of the object
What is the relationship between air density and height above sea level?
As height increases, air density decreases
What is the relationship between height above sea level and air pressure?
As height increases, air pressure decreases
In words, what equation links pressure, force and area?
Pressure = Force divided by area
What is pressure
The force exerted on 1m²
What is the relationship between pressure and area?
As the area increases, the pressure decreases
What units do we use to measure pressure?
N/m²
What is the relationship between pressure and force?
As the force increases, the pressure increases