Q. A force acting in the opposite direction to the motion of the body is called force of friction.

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Q. Joule is the unit of

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Q. A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

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Q. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

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Q. The efficiency of a lifting machine is the ratio of

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Q. If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.

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Q. Non-coplaner non-concurrent forces are those forces which

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Q. The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplaner concurrent forces.

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Q. A force while acting on a body may

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Q. A screw jack used for lifting the loads is

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Q. The wheels of a moving car possess

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Q. In order to determine the effects of a force, acting on a body, we must know

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Q. The negative acceleration is called retardation.

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Q. The maximum displacement of a body, from its mean position is called amplitude.

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Q. A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.

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Q. The cartesian equation of trajectory is(where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

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Q. In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.

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Q. The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position.

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Q. The unit of moment of inertia of an area is

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Q. A pendulum which executes one beat per second is known as

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