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  • Question

  • According to Law of Triangle of Forces


  • Options
  • A. three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
  • B. three forces acting along the sides of a triangle are always in equilibrium
  • C. if three forces acting on a, point can be represented.in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium
  • D. if three forces acting at a point are in equilibrium each force is proportional to the sine of the angle between the other two
  • E. if the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order.

  • Correct Answer
  • if the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order. 

    • Applied Mechanics problems

    Search Results

    • 1. A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be

    • Options
    • A. zero
    • B. infinite
    • C. gr
    • D. 2gr.
      • Discuss
    • 2. The inherent property of a body which offers reluctance to change its state of rest or uniform motion, is

    • Options
    • A. weight
    • B. mass
    • C. interia
    • D. momentum.
      • Discuss
    • 3. The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. The velocity ratio of the differential wheel and axle is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. For maximum range of a projectile, the angle of projection should be

    • Options
    • A. 30°
    • B. 45°
    • C. 60°
    • D. none of these.
      • Discuss
    • 6. A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec2. Time required to traverse a distance of 1.5 m, is

    • Options
    • A. 40 sec
    • B. 30 sec
    • C. 20 sec
    • D. 15 sec
    • E. 10 sec.
      • Discuss
    • 7. Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

    • Options
    • A. is directly proportional to their velocity of approach
    • B. is inversely proportional to their velocity of approach
    • C. bears a constant ratio to their velocity of approach
    • D. is equal to the sum of their velocities of approach.
      • Discuss
    • 8. The units of moment of inertia of an area, are

    • Options
    • A. kg/m
    • B. kg/m2
    • C. m4
    • D. m3
    • E. kg-m2.
      • Discuss
    • 9. Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after impact would be

    • Options
    • A. zero
    • B. 5 m/sec
    • C. 10 m/sec
    • D. none of these.
      • Discuss
    • 10. Equation of motion of a point in a straight line, is

    • Options
    • A. v = u + ft
    • B. S = ut + ft2
    • C. 2fS = v2 - u2
    • D. all the above.
      • Discuss

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