November 13 Q2 - pg. 9 Daily Goal: We will be able to diagram what happens to particles when they are heated and explain how heat moves. Homework: Gist.

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Presentation transcript:

November 13 Q2 - pg. 9 Daily Goal: We will be able to diagram what happens to particles when they are heated and explain how heat moves. Homework: Gist Science Starter: Why does sound move faster in higher temperatures than colder temperatures? Do particles in hotter temperatures have more or less energy? Do particles that are hotter move more or less than colder particles?

Table of Contents – Quarter Two Parts of the Ear and Test Preparation Q2 - PG. 1 Physical and Chemical Changes Intro Q2 – PG. 3 Physical and Chemical Properties Q2 – PG. 5 Density and Intro to Heat Transfer Q2 – PG. 7 Heat Transfer – Particle Movement Q2 – PG. 9

Demo Time!

Think Critically Do you think you would be warmer sitting in a chair or running laps? Why? Does it take more energy to sit still or to run laps?

What is heat? ***WRITE THIS DOWN IN YOUR GLOSSARY *** Heat is a kind of energy. It travels from warmer objects or locations to colder objects or locations, but it never goes the opposite way.

Transfer **write this down*** Energy can be transferred from one location to another Energy can be transferred in three ways: by conduction, by convection, and by radiation.

Why does heat move? Think about this: Imagine that you fill up a glass with ice cubes. At first, the cup and the ice cubes have different temperatures. But, the ice will start to ___________. (What will happen to the ice?) It will start to melt! When it melts, it will turn into water. The water will eventually have the same temperature as the cup. Will the temperature of the water and the cup be lower or higher than the temperature of the original ice cubes? Will it be lower or higher than the original temperature of the cup?

Activate Prior Knowledge Take 1 minute to write down an explanation of how sound moves in your notebook. Like sound waves, the particles in the ice cubes and the particles in the cup transferred energy by bumping into each other.

How does Heat Move? ***WRITE THIS DOWN*** Heat always moves from warmer to colder objects never from colder to warmer. If that happened, the ice would get colder and the cup would get hotter. You know that never happens!

Think – Pair - share Why do ice cubes melt in drinks? Why does hot chocolate get colder but make our hands warmer? Which substance is warmer? What is happening to the particles in the drink? In the ice? Describe the energy transfer.

does the heat stop moving? ***WRITE THIS IN YOUR GLOSSARY*** Equilibrium – when two substances reach equal temperatures through the transfer of heat energy

Particles On the move ***WRITE THIS DOWN *** When heat increases THEN energy increases The more energy a particle has THEN the more and the faster it moves

November 15 Q2 - pg. Daily Goal: We will be able to describe why hot air balloons can fly. Homework: Gist Science Starter: Particles with a higher temperature also have a higher amount of what? Heat energy always move from warmer to colder objects or colder to warmer objects?

Heat Moves in 3 ways

Convection ***Write this down*** Convection is the movement of heat by a liquid such as water or a gas such as air. The liquid or gas moves from one location to another, carrying heat along with it. This movement of a mass of heated water or air is called a current.

Convection One way that liquids and gases differ from solids is that they can flow. (What does flow mean?) This makes them fluids. ***WRITE THIS DOWN*** Convection – heat transfer in a fluid by movement of heated particles

Convection **Write this down*** In convection, the particles actually move from one place to another.

Brain Boost: Could convection happen in a vacuum? Relate convection to another type of energy we have learned about.

Lets See Convection in Action Demos: Flying Tea Bag Candle Spiral

Hot air balloons use convection to fly:

These are Kongming Lanterns

They were created in China by a military strategist whose nickname was Kongming. They used the lanterns in the 3rd century as a signal during battles. Now they are used in festivals in China, Taiwan and Thailand. Some people in the US also use them for celebrations like weddings.

Examples of Convection What are some examples of heat transfer through fluids can you think of? Make a list of examples in your notebook. Write down at least 4.

Share Out! We will make a list of your ideas. Add to the list in your notebook if someone mentions an example that you don’t have. We will draw one of your examples as a diagram. Make sure to label the direction of heat transfer (from hot to cold).