Final answer:
The total mass of the smaller pieces of wood remains the same as the original log, 200kg, due to the conservation of mass.
Step-by-step explanation:
The question concerns the conservation of mass. When a 200kg log of wood is cut into smaller pieces, the total mass of those pieces put together remains the same as that of the original log, assuming no matter is lost in the process. This principle is an important part of physics that falls under the topic of conservation laws, specifically the law of conservation of mass. If the log was divided into 2 equal pieces, each piece would have a mass of 100kg. Therefore, the total mass of all the smaller pieces put together would be 100kg + 100kg = 200kg Therefore, the correct answer to what is the total mass of all the smaller pieces put together is 200kg, which corresponds to option 2).