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I can comment on most of these questions. Some might seem underspecified,
but I listed them in general terms without all the specifics. Didn't mean
to confuse anyone. I wonder what questions teachers on this list ask their
students.
#1: Might have been better to ask what is the acceleration at any time
(10 > m/s2 downward as gravity is constant).
#2: Acceleration on incline depends on angle, so concave hill wins since
ball has highest acceleration at start.
#3: Car acceleration is constant. Balloon moves forward as it has less
inertia (like bubble in level with cart/pulley). These are similar.
#5: Both teams pull with same force (related to #4 -- like a two-person
game). Winner determined by friction on ground. Can show this with
two-person game with different shoes, or one person on skateboard, etc.
#13 "Three bulbs in series" is not vague, even without a diagram. Not sure
what the confusion is here. Kids just think electrons leave the negative
battery terminal, so the bulb closest to this should receive current
first. They forget what is happening at the other terminal and where the
electrons are in the circuit.
#14: This is asked after I teach about reflection, refraction,
diffraction, and interference.
#15: Mirror is fixed (can't be wiggled).
#16: Kids don't draw ray diagram.