Day 52: Balanced Forces in Motion

College-Prep Physics: We’ve been looking solely at forces in static cases. Now it’s time to look at moving cases. So I asked students to complete the following chart on a whiteboard:

2015 CP 02 BFPM (1)

What’s true about the forces in the constant speed cases? In the speeding up and slowing down cases?

Then I tried to address the misconception/difficulties kids have with constant speed = balanced forces (wouldn’t it just not move?) by demo’ing dueling fan carts. First with fan carts off, then with both on — what happens after I push?

imag0454-scaled-1000

NGSS Science and Engineering Practices:
#2. Developing and using models

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About Frank Noschese

HS Physics Teacher constantly questioning my teaching.

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