Forces in Fluids: Buoyancy and Density

The video tutorial explains the concept of buoyancy using a rubber duck as an example. It describes how buoyant force acts on submerged objects and how this force is influenced by the object's density. The tutorial further defines density as the mass per unit volume and illustrates how objects with different densities behave in water. The density of water is given as a reference point to determine whether objects will float or sink.

What is the force called that pushes an object like a rubber duck to the surface of the water?

• Frictional force

• Gravitational force

• Magnetic force

• Buoyant force

What happens to an object if its weight is less than the buoyant force acting on it?

• It remains stationary

• It accelerates upward

• It moves sideways

• It sinks

Why does a rock sink in water while a rubber cork floats?

• The cork is heavier than the rock

• The rock is less dense than water

• The cork is denser than water

• The rock is denser than water

How is density defined in terms of mass and volume?

• Mass per unit of volume

• Volume per unit of length

• Mass per unit of length

• Volume per unit of mass

What is the density of water in grams per cubic centimeter?

• 0.5 grams per cubic centimeter

• 1 gram per cubic centimeter

• 1.5 grams per cubic centimeter

• 2 grams per cubic centimeter