Physics Chapter 17-Energy Transfer by https://padlet.com/ronaldoyee_161/n1n1wehz8e4f en-us 2016-10-03 02:11:38 UTC 2024-11-24 16:40:37 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Hotsun.png Thermal Energy ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127769430 Objects with a temperature contain thermal energy due to the vibration of the atoms in a solid. 
The motion of thermal energy is known as heat.
Thermal energy move from a warm object to a cold object by itself*. The flow of thermal energy stop when both objects have the same temperature.
*If thermal energy could move from a cool region to warm region, cold objects will get colder]]> 2016-10-03 02:13:35 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127769430 Ways to transfer thermal energy from an object to another  ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127770106
  • Conduction
  • Convection
  • Radiation
    • Thermal energy moves from a warmer object to a cooler object through these ways
    ]]>     2016-10-03 02:22:23 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127770106     Conduction ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127770766 If you stick a piece of wax on an end of a horizontal bar and heat up the other end of the bar, the wax will melt after some time. 
    If you replace the bar with another one of a different material and if the wax take a longer time to melt, the bar is a poor conductor of heat, known as an insulator.
    Our sweater should be made from an insulator so that we do not lose thermal energy from our body]]>     2016-10-03 02:31:33 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127770766     Convection ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127771926 Hot water rise and cold water sink]]> 2016-10-03 02:51:10 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127771926 Sea and Land Breeze ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127773146 2016-10-03 03:13:39 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127773146 Radiation ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127773237 Hot water of the same temperature is poured into 2 containers with different colour (one silver one black). After some time, the water in the black container will have a lower temperature. 
    This is because black radiates thermal energy well. (Note that the water lose heat by radiation)
    Also note that an object that release heat well also absorb heat well.
    Thermal energy from the sun reach the earth through radiation(outer space is largely a vacuum)
    Therefore, to stay cool on a sunny day, wear white clothes which reflects heat]]>     2016-10-03 03:15:04 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127773237     Vacuum Flask ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127773753 The vacuum prevents heat loss through conduction and convection. Silvered surfaces prevent heat loss through radiation. The plastic cap prevents heat loss through convection and evaporation.
    Reference: Lee N. 2016. MS981 Science For Everyday Living Physics Course Book Polytechnic Foundation Programme 2016/2017. [Online Picture] Singapore: Singapore Polytechnic. P 103. Available from: https://is.gd/4a4HkK . [Accessed: 3 October 2016]]]>     2016-10-03 03:22:57 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/127773753     Dial Gauge ronaldoyee_161 https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/134073651 The needle in a dial gauge will spin one full round if there is a 1mm change in length of an object. This can be used to prove that things will expand when heated. Connect the dial gauge to the object and heat up the object. You will see the needle in the dial gauge spinning.]]> 2016-10-30 10:04:56 UTC https://padlet.com/ronaldoyee_161/n1n1wehz8e4f/wish/134073651