What is the difference between mass and weight? Mass O Quantity of matter O Measured with a balance O How much “stuff” is there O Constant Weight O Measure of force of gravity O Measured with a spring scale O Changes depending on where you are Weight Changes O 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! O Now, would we have a different mass reading for both places? What is the difference between temperature and heat? Temperature vs. Heat O 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. Temperature O Measured in Celsius degree or Kelvin in Chemistry O Measured with a thermometer Heat O Results from temperature difference O Measured in joules or calories O Measured with a calorimeter Let’s Look at These Closer.. O Place 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.