Question

variables and hypothesis practice
independent (manipulated) variable - is the factor that is changed on purpose in an experiment.
dependent (responding) variable - is the factor that might be affected as a result of the independent variable. this is the thing that you are measuring in your experiment.
controlled variable - all the other parts of the experiment that you do not allow to change. there are always multiple controlled variables.
hypothesis - must be an if / then statement. if i do this assignment, then i will get credit.
for each experiment below, specify that independent, dependent and controlled variables. also write an appropriate hypothesis.

1. rubber balls of different sizes are dropped from the same height to see which one bounces the highest.

independent variable:
dependent variable:
controlled variable:
controlled variable:
hypothesis:

Explanation:

Step1: Identify independent variable

The size of the rubber - balls is changed on purpose.
Independent Variable: Size of the rubber balls

Step2: Identify dependent variable

The height the ball bounces is what is being measured and is affected by the size.
Dependent Variable: Bounce height of the rubber balls

Step3: Identify controlled variables

The height from which the balls are dropped should be kept the same, and the type of surface they bounce on should also be the same.
Controlled Variable: Drop - height
Controlled Variable: Surface type

Step4: Write hypothesis

If the size of the rubber ball is larger, then it will bounce higher.

Answer:

Independent Variable: Size of the rubber balls
Dependent Variable: Bounce height of the rubber balls
Controlled Variable: Drop - height
Controlled Variable: Surface type
Hypothesis: If the size of the rubber ball is larger, then it will bounce higher.