P11: Pressure Flashcards

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1
Q

What is the equation for pressure?

A

Pressure = force/area

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2
Q

What is the equation for the pressure of a liquid?

A

Pressure = height x density x gravitational field strength

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3
Q

What are the units for density?

A

Kg/m^3

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4
Q

Describe how upthrust occurs

A

When an object is submerged in liquid, it experiences a greater pressure on the bottom of the surface than on the top. This creates a resultant force upwards, which is upthrust.

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5
Q

What happens to the atmosphere when altitude is increased?

A

It gets less dense

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6
Q

What happens to the number of air molecules above a surface as the height of the surface above ground level increases?

A

The number decreases

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7
Q

Describe the air when the height of a surface increases

A

There is less air above the surface than below it meaning, atmospheric pressure decreases as the height increases

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8
Q

What determines the pressure of an object in liquid?

A

The weight of the water above the object, the density of the liquid and the gravitational field strength

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9
Q

When would an object sink?

A

If it is more dense than the liquid

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10
Q

When would an object float?

A

If it is less dense than the liquid

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