Pressure And Properties of Matter - SS1 Physics Past Questions and Answers - page 3
Explain Archimedes' principle and how it relates to buoyancy.
Archimedes' principle states that when an object is immersed in a fluid, it experiences an upward force known as buoyant force, which is equal to the weight of the fluid displaced by the object. This principle is based on the concept that the pressure exerted by a fluid increases with depth. The buoyant force acts in the opposite direction to the gravitational force, causing objects to feel lighter in a fluid. This principle helps explain why objects float or sink in different fluids and provide the foundation for understanding buoyancy.
Users' Answers & CommentsDiscuss the factors that affect the buoyant force acting on an object submerged in a fluid.
The buoyant force acting on an object submerged in a fluid depends on several factors. Firstly, it is directly proportional to the volume of the fluid displaced by the object. The greater the volume of the fluid displaced, the greater the buoyant force.
Secondly, the density of the fluid also affects the buoyant force. If the fluid is denser than the object, the object will float as the buoyant force exceeds its weight. On the other hand, if the object is denser than the fluid, it will sink as the buoyant force is less than its weight. Lastly, the shape and orientation of the object also impact the buoyant force. Objects with larger surface areas experience greater buoyant forces.
Users' Answers & CommentsWhich of the following is the correct definition of density?
The amount of mass an object possesses
The measure of the total volume of an object
The ratio of an object's mass to its volume
The force acting on an object due to gravity
Which of the following units is commonly used to express density?
Kilograms (kg)
Cubic meters (m3)
Newtons (N)
Kilograms per cubic meter (kg/m3)
What happens to the density of a substance if its mass remains the same but its volume increases?
The density increases
The density decreases
The density remains the same
It is not possible for the volume to increase without changing the mass
Specific gravity is a dimensionless quantity that compares the density of a substance to the density of which of the following?
Water
Air
Vacuum
Mercury
If a substance has a specific gravity of less than 1, it means that the substance is:
Less dense than water
Denser than water
Equally dense as water
Not related to the density of water
Explain the concept of density and how it is calculated.
Density is a measure of how much mass is packed into a given volume of a substance. It is calculated by dividing the mass of an object by its volume. Mathematically, density = mass/volume. For example, if we have two objects with the same volume but different masses, the one with the higher mass will have a higher density.
Users' Answers & CommentsDefine specific gravity and explain how it relates to the density of a substance.
Specific gravity is a dimensionless quantity that compares the density of a substance to the density of a reference substance, usually water. It is calculated by dividing the density of the substance by the density of water. Specific gravity is useful in determining the relative density of a substance and comparing it to the density of water. If the specific gravity of a substance is less than 1, it means that the substance is less dense than water and will float on its surface. If the specific gravity is greater than 1, the substance is denser than water and will sink.
Users' Answers & Comments