18 Questions
What is the force exerted by a fluid on an object in the opposite direction to the force of gravity?
Upthrust
Why does an iron nail sink when placed on the surface of water?
The weight force of the nail is greater than the upthrust of water.
What does the density of a substance indicate?
The mass per unit volume of the substance
Why does a cork float while an iron nail sinks in water?
Cork has a lower density than water, while iron nail has a higher density.
What happens to the force exerted by fluid in all directions in a confined mass of fluid?
It remains undiminished in all directions
What force allows an object to float in a fluid?
Upthrust
Why does an object of density greater than that of a liquid sink in the liquid?
The upthrust of the liquid on the object is less than the weight of the object.
What happens to the elongation of a rubber string when a stone suspended from it in air is immersed in water?
The elongation decreases.
Why is it difficult to hold a school bag with a thin and strong string strap?
The buoyant force on the bag is high.
What is buoyancy?
The force exerted by a fluid that opposes the weight of an immersed object.
In Archimedes' Principle, what happens when an object is placed on the surface of water?
The object floats if its density is less than that of water.
What does it mean when the upthrust of water on an iron nail is less than the weight of the nail?
The nail will sink in water.
What is the upward force exerted by water on an object immersed in it known as?
Buoyant force
What happens to the buoyant force when an object is pushed deeper into the water?
It increases
What is required to keep an object completely immersed in water when released?
Balanced downward force
Why doesn't an object stay immersed in water after it is released?
Upward force is greater than weight
Why doesn't a ship made of iron and steel sink in sea water?
Buoyant force exerted by water exceeds ship's weight
What depends on the density of the fluid when an object is immersed in it?
Buoyant force experienced
This quiz involves observing the elongation of a rubber string due to a suspended weight in air and in water. Additionally, it explores the concept of density in relation to objects sinking or floating in water.
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