a. Design 
Write a procedure to find your cart's acceleration.
b. Measure 
Run it. Table, units, resolutions. Report .
c. Derive 
Get in terms of , , — symbols only.
d. Predict & Test 
Substitute. Place gate 2. Run it. Percent error in the time.
e. Evaluate 
Which measurement hurt you most? Which direction?
f. Reason 
Steeper ramp — does go up, down, or stay?
g. Argue 
Defend a classmate's claim with two reasons.