Try this fun experiment in class. All you need is a weighing scale.
1. Stand on the weighing scale and raise our arms high above your head. Read the dial and note how many kilograms you weigh.
2. Lower your arms rapidly to your sides. You are suddenly many kilograms lighter. A few seconds later, your normal weight returns.
Why does this happen?
For every action, there is an equal and opposite reaction- we all know this is one of Newton's famous laws of physics. Bringing your arms down rapidly is an action that you created. The opposite reaction is a force that pushes up and this was created by the weighing scale. The components of the weighing scale detected the temporary upward force and recorded it as weight loss.
Try this experiment in your class and write to us about experience or suggestions at firstname.lastname@example.org