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Science > Forces in Fluids > Flashcards

Forces in Fluids Flashcards

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0
Q

what causes pressure in fluids

A

all the forces exerted by the individual molecules in a fluid add together to make the pressure exerted by the fluid

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1
Q

Pressure

A

equal to the force exerted on a surface divided by the total area over which the force is exerted

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2
Q

Whats a pascal?

A

a unit of pressure: 1N/m2

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3
Q

Whats the formula for Pressure?

A

Force/ Area

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4
Q

if Area increases Pressure ___________

A

Decreases

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5
Q

If Force increases, pressure_____________

A

Increases

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6
Q

Air is a _________

A

FLuid

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7
Q

How does pressure relate to elevation?

A

The higher the elevation, the lower the pressure or vice versa

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8
Q

How does water pressure relate to depth?

A

Lower the depth of water, the higher the pressure

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9
Q

Whats a fluid?

A

a substance whose shape can easily change

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10
Q

What is pascals principle?

A

When force is applied to a confined fluid, pressure increases equally to all parts of the fluid

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11
Q

What is a fluid filled tube that multiples the force applied by the smaller piston?

A

Hydraulic system

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12
Q

What is an example of a hydraulic system?

A

Brakes in a car

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13
Q

Whats a force pump?

A

When a system has pressure on one end and a whole in the other, force the fluid out.

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14
Q

What an example of a force pump?

A

A toothpaste tube

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15
Q

Whats a force pumped used for?

A

to move a fluid from one place to the other by increasing the pressure on the fluid

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16
Q

If both pistons have the same area they will also experience the same ___________

A

force

17
Q

Buoyant force-

A

a force that acts on submergedobjects

18
Q

Water displacemant-

A

submerged objects take up space and displace water equal to its volume

19
Q

Archimedes principle-

A

states that buoyant force on an object is equal to the weight of the fluid thats displaced by an object

20
Q

Density-

A

its mass per unit volume

21
Q

Why does an object feel lighter when its underwater than when its in the air?

A

Because it has a buoyant force acting on it against gravity

22
Q

If an object floats on the surface and displaces 10 cm how much does that object weigh ?

A

10 grams

23
Q

if an object sinks its density is________

A

grater than the density of the fluid

24
Q

If an object floats on the surface _________________

A

its density is less than the density of the fluid.

25
Q

If an object floats at constant level________________

A

Its density is equal to the density of the fluid

26
Q

Bernouli’s princlple

A

States that pressure exerted by moving fluid is less than the pressure of the surrounding area

27
Q

Is the upside down wing being pushed upward or downward?

A

Downward

28
Q

If the wind speeds up what will happen to the force pushing on the wing?

A

There is less pressure on the top of the wing and more pressure on the bottom which causes lift

29
Q

On a fireplace…… As the wind speeds uo, what happens to the speed of the rising smoke in the chimney?

A

The smoke will rise faster because there is less pressure outside the chimney because of them moving fluid. inside there is more pressure.

30
Q

What makes a difference with walking on snow shoes help you in the snow?

A

The different size of area on which your weight is distributed lowers the pressure you put o the snow

31
Q

Why is there more pressure when you have on high heels than when you have on normal shoes?

A

Because there is less area which increases the pressure applied to a surface

32
Q

What are two examples of Pascals principle?

A

Brakes and a hydraulic lift

33
Q

What causes air planes to fly?

A

When pressure exerted by a moving fluid is less than the pressure of the surrounding fluid it causes lift, which makes a plane fly

34
Q

Does air move faster on the top of the wing or at the bottom?

A

The top

35
Q

How did the egg fit in the bottle?

A

Beacause there was a difference in air pressure, and there is pressure oushing from all side, which caused the egg in sqush in which let in go through the bottle.

36
Q

The more volume an object has the more___________

A

Water it displaces

37
Q

What are 2 examples of Bernoulis principle?

A

The shower curtain and a fir place

38
Q

What direction does a bouyant force act?

A

Upward

39
Q

If the force on an object in the air is 9.8 then it is placed in the water and the force is now 7.8. Whats the bouyant force on the object

A

2 Newtons

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