Pressure, Gravity, and Moments

Question 1

What is the formula for calculating pressure?

Answer 1

Pressure = Force / Area

Question 2

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

Answer 2

True

Question 3

What unit is pressure commonly measured in?

Answer 3

Pascals (Pa)

Question 4

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

Answer 4

100

Question 5

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

Answer 5

Inverse relationship (Boyle’s Law)

Question 6

What is the formula for calculating gravitational force?

Answer 6

Gravitational Force = Mass × Gravitational Acceleration

Question 7

What is the standard acceleration due to gravity on Earth?

Answer 7

9.81 m/s²

Question 8

Define ‘moment’ in the context of physics.

Answer 8

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

Question 9

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

Answer 9

Moment = Force × Distance from pivot

Question 10

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

Answer 10

True

Question 11

What is the unit of measurement for moments?

Answer 11

Newton-meters (Nm)

Question 12

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

Answer 12

perpendicular

Question 13

What does Pascal’s principle state?

Answer 13

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

Question 14

What is the relationship between weight and mass?

Answer 14

Weight = Mass × Gravitational Acceleration

Question 15

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

Answer 15

False

Question 16

What is a couple in terms of moments?

Answer 16

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

Question 17

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

Answer 17

distance

Question 18

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

Answer 18

True

Question 19

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

Answer 19

Resultant force

Question 20

What is the principle of moments?

Answer 20

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

Question 21

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

Answer 21

temperature

Question 22

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

Answer 22

Pressure increases with temperature.

Question 23

What does the term ‘buoyant force’ refer to?

Answer 23

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

Question 24

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

Answer 24

True

Question 25

Define Density

Answer 25

The density of a substance is its mass per unit volume

Question 26

State Archimedes principle

Answer 26

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

Question 27

The law of flotation

Answer 27

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

Question 28

State Boyle’s Law

Answer 28

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

Question 29

Newtons Law of Gravitation

Answer 29

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

Question 30

Newtons Law of Universal Gravitation

Answer 30

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.

Question 31

Define Moment of a force

Answer 31

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

Question 32

If a body is in equilibrium then

Answer 32

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