Question

Use the table of criteria for an investigation to answer the question.

Effect of Object Mass and Drop Height on Gravitational Study
Object To Be Dropped Drop Height (meters)
10-gram ball 5
5-gram ball 8
18-gram ball 10
A student designs an investigation to study the effect of gravity on objects on Earth. He will use the criteria shown. How can the student improve the investigation?

(1 point)
Responses

by finding balls made from different materials
by finding balls made from different materials

by measuring the circumference of the balls
by measuring the circumference of the balls

by dropping the balls from the same height
by dropping the balls from the same height

by using balls that are the same mass

Answer 1

by dropping the balls from the same height

Reason: to test how mass affects fall under gravity you must control drop height so differences in fall time come from mass (and not from different starting heights).