What name is given to "an object or group of objects that we wish to consider for a physics problem?

System

Explanation:

A system is an object or group of objects that we wish to consider for a physics problem. Examples of systems are universe, house and its surroundings etc.

There are three different types of systems which are:

Isolated system: In this type of system there is no energy or matter exchange with the surroundings. Closed system: In this type of system, only energy is exchanged with the surroundings, matter is not exchanged. Open system: in this system both matter and energy are exchanged with the surroundings..

I’m not sure about this question

Answer(b) both involve the use of levers;