Experiment #5 - Forces (Interactions)
1st picture: Get your child to use his/her 洪荒之力(as much effort) to push against the wall till he perspires. Is he/she doing work? NO
2nd picture: Get your child to 不费之力(not much effort) and the chair from one end to the other. Is he/she doing work? YES
In the Science language, work is defined as energy done over a distance.
My students understood the link when a tangible and physical action is carried out. They get to see, they get to do. They get to understand too!
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)
Experiment #4 - Forces (Interactions)