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Physics > Pressure, Gravity, and Moments > Flashcards

Pressure, Gravity, and Moments Flashcards

1
Q

What is the formula for calculating pressure?

A

Pressure = Force / Area

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2
Q

True or False: Pressure increases with depth in a fluid.

A

True

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3
Q

What unit is pressure commonly measured in?

A

Pascals (Pa)

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4
Q

Fill in the blank: The pressure at a depth of 10 meters in water is approximately _____ kPa.

A

100

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5
Q

What is the relationship between pressure and volume at constant temperature?

A

Inverse relationship (Boyle’s Law)

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6
Q

What is the formula for calculating gravitational force?

A

Gravitational Force = Mass × Gravitational Acceleration

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7
Q

What is the standard acceleration due to gravity on Earth?

A

9.81 m/s²

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8
Q

Define ‘moment’ in the context of physics.

A

Moment is the measure of the tendency of a force to rotate an object about an axis.

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9
Q

What is the formula for calculating the moment of a force?

A

Moment = Force × Distance from pivot

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10
Q

True or False: A moment can be calculated using a force applied at an angle.

A

True

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11
Q

What is the unit of measurement for moments?

A

Newton-meters (Nm)

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12
Q

Fill in the blank: The moment of a force is maximized when the force is applied _____ to the lever arm.

A

perpendicular

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13
Q

What does Pascal’s principle state?

A

Pressure applied to an enclosed fluid is transmitted undiminished in all directions.

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14
Q

What is the relationship between weight and mass?

A

Weight = Mass × Gravitational Acceleration

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15
Q

True or False: The center of mass and the center of gravity are always the same point.

A

False

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16
Q

What is a couple in terms of moments?

A

A pair of equal and opposite forces acting on an object that create rotation.

17
Q

Fill in the blank: The moment of a couple is calculated by multiplying one of the forces by the _____ between them.

A

distance

18
Q

True or False: An object is in equilibrium when the sum of all moments about any point is zero.

A

True

19
Q

What is the term for the weight of an object acting at its center of gravity?

A

Resultant force

20
Q

What is the principle of moments?

A

For an object in equilibrium, the sum of clockwise moments equals the sum of counterclockwise moments.

21
Q

Fill in the blank: The pressure exerted by a gas is directly proportional to its _____ at constant volume.

A

temperature

22
Q

What is the effect of temperature on gas pressure, assuming volume is constant?

A

Pressure increases with temperature.

23
Q

What does the term ‘buoyant force’ refer to?

A

The upward force exerted by a fluid on an object immersed in it.

24
Q

True or False: An object will float if its density is less than the density of the fluid.

A

True

25
Q

Define Density

A

The density of a substance is its mass per unit volume

26
Q

State Archimedes principle

A

states that when an object is immersed in a fluid, the upthrust it experiences is equal to the weight of the displaced fluid

27
Q

The law of flotation

A

The law of flotation states that the weight of a floating object is equal to the weight of the fluid it displaces

28
Q

State Boyle’s Law

A

Boyles Law states that at constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure

29
Q

Newtons Law of Gravitation

A

that any two masses in the universe attract each other with a force that is directly proportional to the product of their masses , and inversely proportional to the square of the distance between them

30
Q

Newtons Law of Universal Gravitation

A

that any two point masses in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

31
Q

Define Moment of a force

A

The moment of a force about an axis is equal to the magnitude of the force multiplied by the perpendicular distance from the axis to the line of action of the force

32
Q

If a body is in equilibrium then

A

• The vector sum of the forces in any direction is zero.
• The sum of the moments about any point is zero.

Physics (4 decks)

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