How to use the control variable method to get the experiment?

How to use the control variable method to get the experiment?

Study the factors that affect the speed of evaporation; study the factors that affect the size of friction; study the factors that affect the size of pressure; study the factors that affect the size of kinetic energy; study the relationship between voltage, current and resistance; verify Newton's first and second [high school (resultant force = mass * acceleration)] laws

I'd like to know the contents of physics textbooks for junior three
Now the textbooks are changing quickly. I can't borrow the latest textbooks
So I'd like to ask about the contents now

I'm from PEP
Chapter 11 colorful material world
Chapter 12 movement and force
Chapter 13 force and machinery
Chapter 14 pressure and buoyancy
Chapter 15 work and mechanical energy
Chapter 16 heat and energy
Chapter 17 energy and sustainable development
I'm in ninth grade now
I'm just doing my physics homework according to my textbook``

Mutual conversion between internal energy and light energy
Conversion of light energy to chemical energy
Mutual conversion of chemical energy and electric energy
Mutual conversion of electrical and mechanical energy
Mutual conversion between mechanical energy and internal energy
Conversion of mechanical energy to light energy
Mutual conversion between internal energy and electric energy
Mutual conversion of internal energy and chemical energy
Mutual conversion between internal energy and electric energy
Mutual conversion of internal energy and chemical energy
Please give me an example
Be sure to give an example
Be sure to give an example

Internal energy - light energy conversion: red iron;
Light chemical energy conversion: photosynthesis
Chemical and electrical energy conversion: dry cell;
Electrical energy mechanical energy conversion: motor;
Mutual conversion between mechanical energy and internal energy: heat produced by friction
Conversion between mechanical energy and light energy: sparks produced by flint collision
Mutual conversion of internal energy and electric energy: thermal power plant
Internal chemical energy conversion: decomposition of calcium carbonate at high temperature