Understanding Buoyancy

Which of the following best defines buoyancy?

• The force that pulls objects toward the center of the Earth.

• The upward force exerted by a fluid on an object.

• The resistance of an object to changes in motion.

• The force that holds objects together by gravity.

According to Archimedes' Principle, the buoyant force on an object is equal to the:

• mass of the fluid displaced.

• density of the object.

• weight of the fluid displaced.

• volume of the object.

An object will float in a fluid if:

• Its mass is greater than the fluid’s mass.

• Its density is equal to the fluid’s density.

• Its density is lower than the fluid’s density.

• Its volume is greater than the fluid’s volume.

What happens when an object has the same density as the fluid it is placed in?

• It will float.

• It will sink.

• It will remain suspended in the fluid.

• It will expand in volume.

Which of the following factors directly affects the buoyant force acting on an object?

• The object's color.

• The object's shape.

• The fluid's density.

• The object's temperature.

If the volume of an object increases but its mass stays the same, what happens to its density?

• Increases.

• Decreases.

• Remains the same.

• Doubles.

A piece of wood floats in water, while a metal nail sinks. What property of the wood allows it to float?

• Higher volume.

• Higher mass.

• Lower density.

• Larger surface area.

What determines whether an object floats or sinks in a fluid?

• The fluid's volume.

• The fluid's color.

• The object's density relative to the fluid's density.

• The object's shape.

Why do helium-filled balloons float in air?

• Helium is denser than air.

• Helium has more mass than air.

• Helium is lighter and less dense than air.

• Helium repels gravity.

Which of the following objects will experience the greatest buoyant force in water?

• A small pebble.

• A beach ball.

• A block of steel.

• A floating piece of cork.