A pendulum is constructed from a 1.0-kg mass suspended from the ceiling, with a length of strong string long enough so that, when pulled about 40o from the vertical, the mass comes to nose level. Continue reading
If you ever find yourself stranded in the snowy Arctic (or bored in Minecraft), you’re gonna need to know how to build an igloo. Continue reading
Armed with a hammer made from mercury, Olympia Brown explains the third law of thermodynamics. Continue reading
A scavenger hunt can be used by teachers to direct student learning at any grade level. In this case, a set of carefully worded questions will introduce students to a new topic, ‘Energy Users’. Continue reading
By Varsha Patel, TDSB
I chose to cover luminous sources using this cooperative learning activity (CL) as a way to make the topic more interesting and meaningful to the students. Students can be easily grouped according to the light source for which they are responsible, another reason why this activity works well. It is truly remarkable that once all the instructions (see Instructions sheet) were given out, the students were engaged — working quietly and attentively as they knew they all had roles to perform. Giving a time limit for the various parts of the activity ensured students maintained their level of readiness/involvement.
The machine produced in various sizes, for both industrial and home uses, can easily transform a kilogram of plastic waste into a liter of oil, using about 1 kW·h of electricity but without emitting CO2 in the process. The machine uses a temperature controlling electric heater instead of flames, processing anything from polyethylene or polystyrene to polypropylene (numbers 2-4). Comment: 1 kg of plastic produces one liter of oil, which costs $1.50. This process uses only about 1 kW·h of electricity, which costs less than 20 cents!