Day 23: Bowling Balls, Mallets, and Motion
This is a variation on the classic broom ball activity. Using a mallet, students make the bowling ball do various motions (speed up, slow down, constant speed, sharp left turn, go in a circle, etc.).
Why a mallet instead of the broom, you ask?
- Students come to us with an impulsive view of force. I have found they have trouble with “constant, steady, continuous force” such as from the broom.
- Much easier to see that the ball speeds up / slows down when hit by the mallet and that it travels with constant velocity when not being hit.
- Can easily move from impulsive force to a constant force by making the tapping intervals smaller and smaller.
Students draw motion diagrams and add red arrows to show when and how they tapped the ball. Then we look for a pattern and come up with a casual model for force and motion. Later we use dueling fan carts to revise the model to include NET force.
5 responses to “Day 23: Bowling Balls, Mallets, and Motion”
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- October 12, 2015 -
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Brilliant Frank! Really does get at a naive view of forces. I’m off to find a used bowling ball this weekend!
Thank you for posting this… I did the exercise at Buffalo State, but when I was planning for this year, I couldn’t remember where to guide the students with the lab. Now I know 🙂