A hypothesis is an educated guess written in way that allows us to test whether it is true or not, in a form called if-then. In Galileo's experiment, his hypothesis was that if gravity is a
constant force, then two cannonballs of different weights will still fall at the same rate.
Scientists test a hypothesis by conducting a controlled experiment. In a controlled
experiment, the scientist studies a single factor. He or she tests this one factor by using a
control. In a control, a pair of tests is carried out, and only one factor is changed between
them. This factor, which we control, is called the variable. The only thing different between
the two tests is the variable. In Galileo's case, the two cannonballs were the same. The only
variable factor was the weight.
Which of the following is an example of a hypothesis?
A
a controlled test of gravity's effect on objects
B
I know I won't get a completion grade unless I finish my homework.
с
the variable factor of weight in Galileo's experiment
D
If teeth are exposed to sugar, then they will get cavities.