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Science(Physics Ch1 Force) > Pressure > Flashcards

Pressure Flashcards

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1
Q

What is Thrust?

A

The force acting on an object perpendicular to the surface.

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2
Q

What is pressure?

A

The thrust on unit area is called pressure.

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3
Q

Mathematical representation of Pressure.

A

P=F/A

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4
Q

Pressure is a ____ quantity.

A

Scalar

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5
Q

SI unit of pressure?

A

N/m² or N/m-²(Pascal)

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6
Q

Who is The unit Pascal named after?

A

Scientist Blaise Pascal.

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7
Q

What is Pascal denoted as?

A

Pa

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8
Q

1 Pa=??

A

1Pa= 1N/m²

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9
Q

What is a fluid?

A

It is any substance that has no definite shape and has ability to flow.

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10
Q

What is a fluid?

A

It is any substance that has no definite shape and has ability to flow.

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11
Q

What did Blaise Pascal observe?

A

The pressure in a fluid at rest is the same at all points if they are at same height.

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12
Q

What is a hydraulic lift?

A

The pressure is same on both sides of the enclosed fluid, allowing a small force to lift a heavy object.

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13
Q

What is the mathematical representation of hydraulic lift?

A

P=F1/A1=F2/A2

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14
Q

What is density of a substance?

A

The density p of a substance is defined as its mass per unit volume.

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15
Q

What is mathematical representation of density?

A

P=m/V
(v is volume)

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16
Q

What is SI unit of density?

A

Kg/m³

17
Q

Cgs unit of density.

A

g/m³

18
Q

What does density depend on?

A

The distance between molecules and atoms. The greater the distance, the smaller the density.

19
Q

What is Relative Density (R.D)?

A

The relative density of a substance is the ratio of its density to the density of water.

20
Q

What is R.D also called as?

A

Specific gravity

21
Q

Mathematical representation of R.D?

A

R.D=Ps/Pw
(s is substance and w is water)

22
Q

What is the unit of R.D?

A

SI unit=(kg/m³)/(kg/m³)=unitless

23
Q

If we make two holes in two containers containing liquid with same height?

A

P2-P1=Pgh

24
Q

Which substance has highest density?

A

Mercury. 13.6×10³ kg/m³

25
Q

What is atmospheric ?

A

The envelope of air surrounding the earth is called atmospheric pressure

26
Q

What is Atmospheric pressure?

A

The pressure exerted by the envelope of air surrounding the earth.

27
Q

Atmospheric pressure is approximately _____?

A

10⁵N/m²(Pascal/Newton)

28
Q

What is magnitude of force?

A

It is the strength of force

29
Q

Si unit of Pressure

A

Pascal (N/m²)

30
Q

Cgs unit of pressure?

A

Dyne/cm²

Science(Physics Ch1 Force) (3 decks)

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