ARCHIMEDE'S PRINCIPLE

Samuel observed a large ship floating on the surface of the ocean. He wondered why it was able to float. A ship floats on water because:

• Its density is greater than water.

• It displaces water equal to its weight.

• It is made of a special material.

• It does not experience gravitational force.

When Olivia drops a heavy stone into a swimming pool, the upthrust (buoyant force) acting on it:

• Increases with depth.

• Remains constant.

• Decreases with depth.

• Depends only on the mass of the object.

Emma has a solid object weighing 150 g in air. When she fully immerses it in water, it loses 50 g. What is the buoyant force acting on it?

• 50 g

• 100 g

• 150 g

• 200 g

During a school trip to the lake, Henry noticed that life jackets help people float in water because they:

• Increase the weight of the person.

• Reduce the density of the person.

• Remove the buoyant force.

• Prevent water displacement.

Why do steel ships float on water despite steel being denser than water? Imagine Kai and Maya are on a steel ship, observing how it stays afloat.

• The weight of the ship is equal to the volume of water displaced.

• Ships are hollow and contain air, reducing their average density.

• Buoyant force is negligible for ships.

• The density of water is greater than steel.

Hannah has a metallic sphere that weighs 300 g in air and 240 g when immersed in water. What is the volume of the sphere?

• 40 cm³

• 60 cm³

• 80 cm³

• 100 cm³

When Abigail goes diving in the ocean, she feels less weight underwater because:

• Water density is higher than air.

• Buoyant force reduces the net weight of the diver.

• Gravity decreases underwater.

• Pressure neutralizes the diver's weight.

During a field trip to a naval museum, Luna learned that submarines sink or rise in water by controlling:

• Their mass.

• Their volume.

• The amount of water in their ballast tanks.

• The temperature of water.