Review on Fluids - AP Physics 1

Front

An object is fully submerged in water and experiences a buoyant force equal to:

Back

The weight of the displaced water

Answer explanation

The buoyant force on a fully submerged object equals the weight of the water it displaces, according to Archimedes' principle. Therefore, the correct answer is B, the weight of the displaced water.

Front

If an object floats in a fluid, the buoyant force equals:

Back

The weight of the object

Answer explanation

The buoyant force on a floating object equals the weight of the object. This is due to Archimedes' principle, which states that the upward buoyant force is equal to the weight of the fluid displaced by the object.

Front

Archimedes’ Principle states that:

Back

The buoyant force equals the weight of displaced fluid

Answer explanation

Archimedes' Principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid it displaces. Therefore, the correct answer is C, as it directly describes this relationship.

Front

What happens when something is less dense than water?

Back

It floats.

Answer explanation

When an object is less dense than water, it displaces a volume of water equal to its weight, causing it to float. Therefore, the correct answer is A. It floats.

Front

The SI unit of density is:

Back

kg/m³

Answer explanation

The SI unit of density is defined as mass per unit volume. Therefore, it is expressed as kilograms per cubic meter, which is kg/m³. This makes option C the correct answer.

Front

A 2 m³ block has a mass of 1000 kg. Its density is:

Back

1000 kg/m³

Front

Pressure in a fluid increases with: Depth

Back

Depth

Answer explanation

Pressure in a fluid increases with depth due to the weight of the fluid above. As you go deeper, there is more fluid pressing down, resulting in higher pressure. Therefore, the correct answer is B. Depth.

Front

The SI unit of pressure is:

Back

Pascal

Answer explanation

The SI unit of pressure is the Pascal (Pa), which is defined as one newton per square meter. It measures force applied over an area, making option B the correct choice.

Front

A submarine sinks when:

Back

Weight exceeds buoyant force

Answer explanation

A submarine sinks when its weight exceeds the buoyant force acting on it. This means that the force pushing it up is not enough to counteract its weight, leading to sinking.

Front

Bernoulli’s principle explains that as fluid speed increases, pressure:

Back

Decreases

Answer explanation

According to Bernoulli’s principle, as the speed of a fluid increases, the pressure within the fluid decreases. Therefore, the correct answer is B. Decreases.