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  • Question

  • The following statement is one of the laws of Dynamic friction


  • Options
  • A. The force of friction always acts in a direction opposite to that in which a body is moving
  • B. The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
  • C. For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
  • D. all the above.

  • Correct Answer
  • all the above. 

    • Applied Mechanics problems

    Search Results

    • 1. A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately

    • Options
    • A. 400 watts
    • B. 500 watts
    • C. 4000 watts
    • D. none of these.
      • Discuss
    • 2. The ratio of the reactions RA and RB of a simply supported beam shown in below figure is

    • Options
    • A. 0.50
    • B. 0.40
    • C. 0.67
    • D. 1.00
    • E. 1.50
      • Discuss
    • 3. Pick up the correct statement from the following for the structure shown in below figure.

    • Options
    • A. The horizontal reaction at A is 23t ?
    • B. The horizontal reaction at C is 23t ?
    • C. The vertical reaction at A is zero
    • D. The vertical reaction at C is 2 t ?
    • E. All the above.
      • Discuss
    • 4. M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is

    • Options
    • A. (D4 + d4)
    • B. (D4 - d4)
    • C. (D4 + d4)
    • D. (D4 x d4).
      • Discuss
    • 5. A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be

    • Options
    • A. 0.5 m/sec
    • B. 1.5 m/sec
    • C. 2.5 m/sec
    • D. 3.5 m/sec
    • E. 4.5 m/sec.
      • Discuss
    • 6. A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60°. The velocity attained by the projectile when it is moving at a height of 100 m, is

    • Options
    • A. 70 m/sec.
    • B. 75 m/sec.
    • C. 80 m/sec.
    • D. 85 m/sec.
    • E. 90 m/sec.
      • Discuss
    • 7. The velocity of a moving body, is

    • Options
    • A. a vector quantity
    • B. a scalar quantity
    • C. a scalar as well as a vector quantity
    • D. none of these.
      • Discuss
    • 8. For lifting a load of 50 kg through a distance of 2.5 cm, an effort of 12.5 kg is moved through a distance of 40 cm. The efficiency of the lifting machine, is

    • Options
    • A. 60%
    • B. 65%
    • C. 70%
    • D. 75%.
      • Discuss
    • 9. For maximum range of a projectile, the angle of projection should be

    • Options
    • A. 30°
    • B. 45°
    • C. 60°
    • D. none of these.
      • Discuss
    • 10. The velocity ratio of the differential wheel and axle is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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