Physics: Observing Elongation and Density Interactions

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What is the force exerted by a fluid on an object in the opposite direction to the force of gravity?

Downforce

Weight force

Gravity pull

Upthrust (correct)

Why does an iron nail sink when placed on the surface of water?

The upthrust of water is greater than the weight force of the nail.

The nail is less dense than water.

The weight force of the nail is greater than the upthrust of water. (correct)

The nail has a lower volume than water.

What does the density of a substance indicate?

The force it exerts on other objects

The pressure it can withstand

The mass per unit volume of the substance (correct)

Its weight per unit volume

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. Signup and view all the answers

What happens to the force exerted by fluid in all directions in a confined mass of fluid?

It remains undiminished in all directions Signup and view all the answers

What force allows an object to float in a fluid?

Upthrust Signup and view all the answers

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. Signup and view all the answers

What happens to the elongation of a rubber string when a stone suspended from it in air is immersed in water?

The elongation decreases. Signup and view all the answers

Why is it difficult to hold a school bag with a thin and strong string strap?

The buoyant force on the bag is high. Signup and view all the answers

What is buoyancy?

The force exerted by a fluid that opposes the weight of an immersed object. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

What is the upward force exerted by water on an object immersed in it known as?

Buoyant force Signup and view all the answers

What happens to the buoyant force when an object is pushed deeper into the water?

It increases Signup and view all the answers

What is required to keep an object completely immersed in water when released?

Balanced downward force Signup and view all the answers

Why doesn't an object stay immersed in water after it is released?

Upward force is greater than weight Signup and view all the answers

Why doesn't a ship made of iron and steel sink in sea water?

Buoyant force exerted by water exceeds ship's weight Signup and view all the answers

What depends on the density of the fluid when an object is immersed in it?

Buoyant force experienced Signup and view all the answers

Physics: Observing Elongation and Density Interactions

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