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sorry i did not get ii) how do u work with just adding 2 forces in different directions and not even considering the angle? is that even possible??Q3ii)since there is no accel. therefore log is said to be in equilibrium i.e. not external force acting related with newtons first law
Q3 iii) weight component downward + frictional force equal to tension
Q3 iv) since friction is involved there will be loss of energy due to friction