Question

A. Describe a procedure using these supplies that caleb may follow to test his

B. Explain the most likely reason caleb uses the same wooden block for each test
C. Identify the independent and dependent variables for this investigation

Answer 1

Not enough information. You only showed us the questions.

I can answer the last question:
The independent variable is what you change, and the dependent variable is what changes because of that.

Answer 2

im not exactly sure what you're asking, if you could give more context that'd be great, But i tried to answer C as best as i could, and i don't have enough context for A or B. but anywho.

C. the dependent variable is the friction being created by caleb, and i think the independent variable is the time that the friction stays on each one of the planks.

:)

(sorry i couldn't fully answer your question, i don't have enough context for this)