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A wooden block of mass 2 kg rests on a soft horizontal floor. When an iron cylinder of mass 25 kg is placed on top of the block, the floor yields steadily and the block and the cylinder together go down with an acceleration of 0.1 m/s^2. What is the action of the block on the floor (i) before and (ii) after the floor yields? (Take, g = 10 m/s^2). Identify the action-reaction pairs in the problem.
Assertion (A) Action and Reaction forces do not cancel out each other. Reason (R) It is because both do not act on the same body.
A boy is trying to push a truck but not able to push it. His friend explains the situation with the help of Newton's third law. His friend says that according to Newton's third law, action-reaction forces are equal and opposite, so they will cancel each other and the net force on the truck will become zero. That's why the truck will not move. Analyse the explanation of his friend and comment that his explanation is right or wrong.
A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in figure. What is the action on the floor by the man in the two cases? If the floor yields a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?
Two bodies A and B of masses 5 kg and 10kg in contact with each other rest on a table against a rigid wall as shown in figure. The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally at A. What are (i) the reaction of the partition or wall (ii) the action-reaction forces between A and B? What happens when the partition is removed? Does the answer to (ii) change, when the bodies are in motion? Ignore difference between μs and μk.
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