What is the difference

between mass and weight?

Mass

OQuantity of matterOMeasured with a balance

OHow much “stuff” is there

OConstant

WeightO Measure of force of gravityO Measured with a spring scaleO Changes depending on where you

are

Weight ChangesO Weight depends on the mass of the

two objects. For Example: Earth is a lot more massive than other planets, therefore the force of gravity pulling us to it is larger, even though we don’t really feel it. Weights change on different planets depending on size. Would we weigh less on the moon, or Earth?

The Moon!

ONow, would we have a different mass reading for both places?

What is the difference between

temperature and heat?

Temperature vs. HeatO Temperature: measure of average

kinetic energy of particles

O Heat: a form of energy that can change the movement of particles, or increase the temp.

TemperatureO Measured in Celsius degree or Kelvin

in ChemistryO Measured with a thermometer

HeatO Results from temperature differenceO Measured in joules or caloriesO Measured with a calorimeter

Let’s Look at These Closer..

OPlace one hand on the top of your desk, and one hand on the leg of the desk. Which feels colder?

Probably the Metal, but why?

O Metal is a great conductor. It will steal warm energy from your body and move it throughout the metal. The heat is spread out and therefore makes the desk appear colder.

Is the metal actually colder?

O No, it has been in the same room as the top all day, so they both have the same temperature, just a different way of adjusting to the temperature of your body when your hands are placed on both materials.

Why does it take your energy?

O The desk is trying to reach equilibrium between your body temperature and the temperature that it is in the room.

O Heat always flows from a warmer region to a cooler region.