Units of Measurement

What is the difference between mass and weight?

• Mass is the measure of the amount of matter in an object. Mass does not change with location or gravitational force.

• Weight is a measure of the force of gravity on an object. Weight can change due to location or gravitational force.

Why does an object weigh differently on Earth, the Moon, and the Sun?

• Weight depends on the gravitational pull of the celestial body.

• Since the moon has weaker gravity than earth, object weigh less there. On the sun, gravity is much stronger, so the same object would weigh much more

Define density and explain how it relates to mass and volume.

• Fundamental property that describes the mass per unit volume of a substance.

• Density = mass/volume

Explain the difference between temperature and heat.

• Temperature is a measure of the average kinetic energy of particles.

• Heat is the transfer of thermal energy from a body to another due to a temperature difference.

What is the difference between fundamental units and derived units?

• Fundamental units are independent

  • Mass, length, time

• Derived units are dependent on fundamental

  • Area, volume, density, force

What is area?

The measure of the extent of a two-dimensional surface within the boundaries of a shape.

What is volume?

The amount of space an object occupies.