Middle school science help?

Question

Give an example of a mental model and a physical model

What is the difference between the manipulated variable, the responding variable, and the controlled variable(s)?

Suppose you wanted to find out how the length of time iyou run affects your pulse rate. What is your:

A - Manipulated variable?

B - Responding variable?

C - Controlled variables? (give two)

Answer 1

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Answer 2

Manipulated variable is what you change in the experiment

Controlled variable is what stays the same in the experiment. It's controlled

Responding variable is what the outcome is in your experiment

I think that would be either A or B

Answer 3

Controlled would be like how fast you run and how long (distance) you run

Responding variable would be how long you wait after the run before you count your pulse

Manipulated varible would be how long (time) u run.

Im not 100% sure about these