A system consists of multiple objects connected by ropes. How many equations need to be written to solve this problem? A) two for each object
B) one or two for each object
C) one for each object
D) two for the system

the correct answer is B

Explanation:

To solve the system they must have the same amount of unknowns as equations,

a) If the system does not have friction, we must write the x-axis equation for each body, therefore we need to write N equations

b) if the system has friction, two equations are needed for each particle

therefore the correct answer is B

a person with a mass of 106kg has a weight of 1060n