Day 126: Newton’s 2nd

Tuesday, 4 March 2014

Y'know, I didn't need to teach this at all this year -- most just looked at the FBD, found the net force, then could calculate the acceleration if I gave them a mass.

Y’know, I didn’t need to teach this at all this year — most just looked at the FBD, found the net force, then could calculate the acceleration if I gave them a mass.

A classwork question.

A classwork question.

My kids got a solid mathematical background in forces during their junior high physical science class. That is to say they know how to calculate forces in newtons and how to find the net force given the acceleration and mass of an object. Like nearly everyone, however, they struggle with “if there’s no net force on an object, the object moves with constant velocity”.

What was the warmup in 4th period?

Screen Shot 2014-03-06 at 6.04.43 AM

 

Almost everyone got the net force for “pull in same direction” and “pull in opposite direction”. Nearly all needed a hint on how “at right angles” looks.

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