Understand: representing motion

Students in a class are measuring balls rolling down ramps. The classroom has some measuring sticks with centimeter markings and some with inch markings. The teacher tells the class to use the measuring sticks with centimeter markings.

Why would the teacher make a decision like this?

(Choice A) ?
Centimeters are better for measuring distance than inches.
(Choice B) ?
Centimeters and inches measure different quantities.
(Choice C) ?
If students use different units, some will get incorrect results.
(Choice D) ?
It is easier to compare measurements when using the same units.

Middle school physics - NGSS

Course: Middle school physics - NGSS?>?Unit 1

Problem