5.32 A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases ? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding ?
In the 1st case, the man lifts the block directly, applying an upward force, same as the block = 250 N
Due to Newton's 3rd law of motion, the downward reaction of the man on the floor = 500 N + 250 N = 750 N
In the 2nd case, the man applies a downward force of 25 kg wt. According to Newton's 3rd law, the action on the floor by the man 500N-250N = 250N
The man should adopt the second case
<p>Mass of the block = 25 kg</p><p>Mass of the man = 50 kg</p><p>Acceleration due to gravity = 10 m/s2</p><p>Weight of the block = 250 N</p><p>Weight of the man = 500 N</p><p>In the 1st case, the man lifts the block directly, applying an upward force, same as the block = 250 N</p><p>Due to Newton's 3rd law of motion, the downward reaction of the man on the floor = 500 N + 250 N = 750 N</p><p>In the 2nd case, the man applies a downward force of 25 kg wt. According to Newton's 3rd law, the action on the floor by the man 500N-250N = 250N</p><p>The man should adopt the second case</p>
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