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Forces and their interactions > Pressure and Pressure Differences in Fluids > Flashcards

Pressure and Pressure Differences in Fluids Flashcards

1
Q

What is the equation for pressure in fluids?

A

Pressure = Force normal to the surface/ area of surface

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2
Q

What is the equation of pressure due to a column of liquid?

A

Pressure = height x density x gravity

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3
Q

Why does pressure increase as you increase in the depth of the column?

A

The weight of the liquid acting downwards increases

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4
Q

Explain upthrust

A

In a column of liquid, there is a greater pressure on the bottom surface of an object than there is top surface of the object.

This means that the force acting on the bottom of the object is greater than the focre acting on the top.

This means that there is an upwards resultant force called upthrust

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5
Q

The size of the uphtrust acting on an object must be [blank] to the [blank] of the object for the object to float

fill in the blank

A

The size of the upthrust acting on an object must be equal to the weight of the object for the object to float

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6
Q

Explain how an object floats

A

If an object can displace its own weight of water then the upthrust will be equal to the weight of the object so the object will float.

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7
Q

Pressure in a column of liquid depends on the depth of the object and the [blank] of the liquid

fill in the blank

A

Pressure in a column depends on the depth of the object and the density of the liquid

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8
Q

When does an object sink?

A

When the weight of the object is greater than the upthrust

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9
Q

What is a fluid?

A

A liquid or gas

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10
Q

Explain why pressure increases as the density of the liquid increases

A

The pressure increases as the density increases because the total weight of the liquid above the object is now greater

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11
Q

How do you calculate the total pressure acting on an object in the water?

A

You find the normal pressure and then ADD the atmospheric pressure given

(Height x density x gravity) atmospheric pressure

it’s cute because they’ve alrdy given you the atmospheric one so you just need to find the sum which is the totla pressure! ALSO, you only do this when they say TOTAL PRESSURE!!!

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12
Q

What are the units of pressure?

A

Pa (pascals)

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13
Q

What are the units of force?

A

Newtons (N)

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14
Q

What units of area?

A

Meters2 (m2)

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15
Q

What are the units for height?

A

Meters (m)

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16
Q

What are the units for density?

A

Kg/m3

17
Q

What are the units for gravity?

A

N/kg

18
Q

What happens to the pressure exerted on an object change when the depth of the object below the surface of the liquid increases?

A

The pressure exerted on the object will increase

Forces and their interactions (17 decks)

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