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NCERT Physics Class 11 Exemplar Ch 5 Laws of Motion Part 7
Q.35. When a body slides down from rest along a smooth inclined plane making an angle of with the horizontal, it takes time . When the same body slides down from rest along a rough inclined plane making the same angle and through the same distance, it is seen to take where p is some number greater than . Calculate the co-efficient of friction between the body and the rough plane.
Answer: General Case
Smooth case:
Acceleration
Rough case
Q.36. Figure shows diagrams for a body of unit mass. Find the force as a function of time.
Answer:
Q. 37 A racing car travels on a track (without banking) ABCDEFA (Figure) . ABC is a circular arc of radius CD and FA are straight paths of length R and DEF is a circular arc of radius . The co-efficient of friction on the road . The maximum speed of the car is . Find the minimum time for completing one round.
Answer: For DEF
For ABC
Time for DEF
For FA and DC
Total time