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Claim-Evidence-Reasoning: (CER) Shoe Bottoms (student handout)
Part I: Background
1. You and your friends are talking about physics class during lunch (obviously…) and your friend says, "yeah, well since
both horizontal and vertical forces are balanced in the free body diagram the object can't be moving!…" How would
you respond?
2. And then, out of nowhere your friends says, "…well, you see, a plane accelerates forward because of the net force provided
by the engines, but when you accelerate forward while walking there is no net force…" How would you respond?
3. Assuming you already didn't lose your lunch. Your other friend asks you a couple questions. How would you respond?
a) "What is normal force?"
b) "I don't understand what coefficient of friction means…"
c) "If a moving object has 10N applied force forward and 20N of frictional force backward can you finish this sentence
concerning the motion of the object?"
The moving object will slow down to a stop and ______________________________________.
Name: Class: Date:
Situation:
You are designing a new pair of all-purpose shoe soles for a client. You have never made shoes before, so let's start
at square-one.
