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welcome to my channel iamp;#39;m john jingshui letamp;#39;s work on the problem 59 in chapter four in this one we can see in this system we have three objects a b c right and then we have the external force f activate and then in this objective when this is this is moving and then this is uh mass a doesnamp;#39;t does not move relative to the c so a and c are kept the same acceleration and then we can see the b never hate is a c this is a whole system and we can say we can consider this three object a b c as united one and as united 1 because a not not move relative to c and b now move to c so they kept the same acceleration do you agree yes so in this one we can do force analysis first thing for objective b we have gravity we have the tension and then because we have the tension so we must have the uh so we can project this tension in x component and y component we assume this angle theta this is angle theta so we have f of t sine and f of t cosine sigma because when we consider it