Densidad: cómo se calcula y por qué algunos materiales flotan

The video tutorial explains how the mass of a train car increases with more people inside, while its volume remains constant, leading to increased density. It discusses the concept of density, comparing steel's density to that of foam, air, and water. The tutorial highlights that objects with a density greater than water will sink, while those with a lower density will float, using steel coins as an example.

What happens to the mass and volume of a train car when more people enter it?

• Mass increases, but volume remains the same

• Both mass and volume increase

• Mass remains the same, but volume increases

• Both mass and volume decrease

How is density defined in the context of this section?

• The volume of an object

• The weight of an object

• The size of an object

• The mass contained within a certain volume

Which material has a higher density than foam but lower than steel?

• Wood

• Water

• Plastic

• Air

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

• 8 g/cm³

• 0.5 g/cm³

• 2 g/cm³

• 1 g/cm³

Why do steel coins sink when thrown into water?

• They are too heavy

• They are too small

• They are not buoyant

• They have a higher density than water