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Physics > Pressure > Flashcards

Pressure Flashcards

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1
Q

What is the equation for pressure?

A

Force normal to a surface

Area of surface

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2
Q

Why does a gas in a box exert pressure on all walls of the box?

A

Its molecules bombard the walls

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3
Q

What is pressure measured in?

A

Pa

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4
Q

What is pressure?

A

The force acting on each square area

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5
Q

What angle is pressure at in a box filled with a gas?

A

Right angles to the walls

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6
Q

What happens to the pressure of a box when the gas inside gains more kinetic energy?

A

It increases

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7
Q

Is pressure related to temperature?

A

Yes

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8
Q

If a gas is in a box then the box is made smaller what happens?

A

Particles become closer together and collisions occur more frequently and the walls are hit more
Pressure increase

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9
Q

What does applying pressure do to a gas?

A

Makes it compress

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10
Q

What does reducing pressure on a gas do?

A

Makes it expand

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11
Q

What is space?

A

A vacuum

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12
Q

What is the pressure of particles high in the Earth’s atmosphere?

A

Low

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13
Q

What is the pressure of particles low in the Earth’s atmosphere?

A

High

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14
Q

Do liquids experience pressure?

A

Yes

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15
Q

Why do liquids experience pressure?

A

Because of the weight of the liquid above the object

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16
Q

At what angle does pressure occur to every surface?

A

Right angles

17
Q

In greater depths of liquid, what is the pressure?

A

Greater

18
Q

What is the formula for pressure due to a column of liquid?

A

Height of column x density of liquid x gravitational field strength

19
Q

Describe the particles/pressure when temperature rises

A
  • more kinetic energy
  • higher speeds
  • more collisions with more force
  • more force = higher pressure
20
Q

What is absolute 0?

A
  • 273.14 degrees C

- 0K

21
Q

What happens at absolute 0?

A

Particles are the coldest they can be
Particles have no kinetic energy
Only force acting upon them is gravity so rather than being suspended in midair they fall to the ground

22
Q

What happens if you heat a can then place it in water?

A
  • can expands due to increasing pressure of particles
  • expanding gas leaves through the entrance so very few particles are inside can
  • when placed in water entrance is sealed and particles cool rapidly
  • cool gas exerts little pressure on inside of can
  • pressure from outside is much higher therefore crushes the can
23
Q

What is Boyle’s Law?

A

Pressure x Volume = Constant

24
Q

What is the mass of a leaf?

A

How much material there is

25
Q

What is the weight of a leaf?

A

The gravitational force acting upon the leaf

26
Q

What is the equation for weight?

A

Mass x gravitational field strength

27
Q

What is the equation for the pressure of a certain depth of liquid?

A

Pressure = height/depth x density x gravitational field strength

28
Q

What is the gravitational field strength of the Earth?

A

10N/kg

29
Q

What is Archimedes’ Principle?

A

The upthrust exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces

30
Q

If the weight of an object is greater than the upthrust will it sink or float?

A

Sink

31
Q

If the upthrust is greater than the weight of an object will it sink or float?

A

Float

32
Q

If the upthrust equals the weight of an object will it sink or float?

A

Float (partly submerged)

33
Q

Does an object experience more pressure on its upper or lower surface?

A

Lower surface

34
Q

What is the equation for the pressure difference at two points in a liquid?

A

Depth difference of the two points x density of the liquid x gravitational field strength

Physics (9 decks)

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