Q4 of 82 Page 78

Figure (5-Q3) shows the displacement of a particle going along the X-axis as a function of time. The force acting on the particle is zero in the region

The slopes AB and CD are constant ,i.e.,, thus for constant velocity the acceleration is zero and ∵ , then force must also go to zero for the constant slope cases.


Hence the option A and C are correct.

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A particle stays at rest as seen in a frame. We can conclude that

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A particle is found to be at rest when seen from a frame S1 and moving with a constant velocity when seen from another frame S2. Mark out the possible options.

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Figure (5.Q4) shows a heavy block kept on a frictionless surface and being pulled by two ropes of equal mass m. At t = 0, the force on the left rope is withdrawn but the force on the right end continues to act. Let F1 and F2 be the magnitudes of the forces by the right rope and the left rope on the block respectively.


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The force exerted by the floor of an elevator on the foot of a person standing there is more than the weight of the person if the elevator is