Homework - Effects of heat

1) iBook: Pages 331 - 333

2) Choose ONE experiment and make a video of you doing the experiment.
    Submit the video below (Worth 1000 XP)

    1 or 2 students per video
    Choose only 1 experiment  
    Explain what are you doing and include:

    • Hypothesis
    • Constant variables
    • Manipulated variables
    • Responding variables
    • Results
    • Conclusions


Experiment 1:
Two identical cups (Black & White) contain boiled water (~100 CO)
Which cup will cool down first?
* You may need a thermometer

          experiment

  • Both cups must be exactly the same size.
  • Both cups must contain exactly the same amount of water at the same temperature.

You may use cans as long as one is black and the other is white.

         experiment

Experiment 2:
Given the following apparatus, which nail will fall first?

         experiment

Use wax to stick the pins to a black and white surfaces as shown above.

  • Both surfaces should be the same size and thickness.
  • Both surfaces should be at the same distance from the heat source.
  • You may use any heat source (for example: candle, light bulb, etc.)

.

.

Experiment 3:
Solar cooker
Solar cooker


Experiment 4:

Question: Can thermal energy be made to do useful work?
Possible Hypotheses: Thermal energy is [not] useful energy that can be used for work.
Materials: Plastic 1liter bottle, Large balloon, Bowl of hot (not boiling) water, Bowl of ice water, Small rock
                                   Thermal energy do work

Procedure
:
1. Cool the balloon and the bottle in the freezer for 5 minutes.
2. Fill the bowl with hot, not boiling, water.
3. Put the balloon over the mouth of the bottle making sure that the air has been squeezed from the balloon. Place the bottle into the hot water.
4. The air inside the bottle should expand and inflate the balloon. After it is inflated, put the bottle in the bowl of ice water and observe it deflate.
5. Design a device to convert this expansion and contraction into usable work, such as lifting a rock. Design a device that circulates hot, then cold, water so that the balloon deflates and inflates without moving the bottle.

Analysis and Conclusion
:
Were you able to make a device that performed useful work?
Can you think of devices that convert thermal energy into motion?
Can you think of a way to convert thermal energy into electrical energy?
Research internal combustion engines and turbine generators.

Example by Poomjai and Nadear (2021)

Example made by Dol (2018)

Example made by Ploy (2017)

Example made by Jackson (2017)

Example made by Mook (2016)

Example made by Mhai (2015):

Example made by Wan and Gain (2015):