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?

Question

A. by measuring the circumference of the balls
B. by finding balls made from different materials
C. by using balls that are the same mass
D. by dropping the balls from the same height

Answer 1

B. by finding balls made from different materials

By using balls made from different materials, the student can test how different materials react to gravity. This can provide a more comprehensive understanding of the effects of gravity on objects on Earth.