January 13 th, 2014 Energy! Applying the Law of Conservation of Energy Transferring Thermal Energy.

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Presentation transcript:

January 13 th, 2014 Energy! Applying the Law of Conservation of Energy Transferring Thermal Energy

Objectives: To apply the Law of Conservation of Energy to solve projectile motion problems To introduce the flow of Thermal Energy through a hands-on investigation Begin transition from Energy into Heat (Part 2 of this Unit)

Agenda Bell Ringer Practice Projectiles CCR introduction Conduct Activity Complete Energy Foldable (due next class) Complete Assignment Energy

Bell Ringer: 1.Scientific Laws answer the question _____________, and are generally mathematical. 2.Scientific Theories answer the question ____________. They are more general and provide a broader description of observable phenomena in the natural world. 3.Provide an energy chain for the following items: WHAT WHY Electrical Thermal Mechanical Radiant ElectricalMechanical Electrical Radiant Sound Thermal

Practice 1 0kg A B C PositionPEKETotal A B C PE = mgh KE = ½ mv 2 g = 9.8m/s 2 PE = mgh PE = 10kg x 9.8m/s 2 x 100m PE = 9,800 kg x m 2 /s 2 100m 9800J0J9800J 0J 9800J 4900J V = ? KE = 4,900 kg x m 2 /s 2 = 5kg x v 2 980m 2 /s 2 = v m/s=v

Investigation TE Thermal Energy can be transferred through three different ways: –Conduction – direct contact –Convection – bulk movement of matter in a fluid –Radiation – the absorption of waves

1 st task Predict what will happen if you simultaneously, place two drops of food dye into the hot water and the cold water. After your hypothesize, carry-out the task!

2 nd Task Dump the dyed cold water down the drain and fill with clean, clear cold water from the tap. Place the Hot Dyed water on top of the cold clear water (see demo for method)

3 rd Task Invert the setup. –Put the cold clear on top of the hot dyed water and make observations.

Convection Clearly the Hot water wanted to be on the top –Although it’s really better to think about the cold water NEEDING to be on the bottom. Explain why you think the cold water needed to be on the bottom. Does density play a role? Which is more dense, hot or cold water? In which material are the particles moving faster? The cold water was more dense, and therefore sank to the bottom. The difference in density caused the motion of the fluid. The cold water is more dense. The particles are moving faster in the hot water, therefore it is less dense.

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