Question

A student designs a gravity experiment. She will time how long it takes different objects to fall from her school's roof to the ground. She will use three objects: a 2-foot-long board, a toy car, and a paper bag. What is wrong with her experiment's design? (1 point)
O The experiment does not test enough objects.
• The school roof is not tall enough to test the effect of gravity on different objects.
• Gravity will not affect how long it takes for the objects to fall to the ground.
The objects do not have the same size, shape, or mass, so any differences in drop times cannot be attributed to one variable.

Answer 1

The last option is correct: the objects differ in size, shape, and mass, so any differences in fall time could be due to those uncontrolled variables (especially air resistance), not just gravity.