Q. The total time taken by a projectile to reach maximum height and to return back to the ground, is known as time of flight.

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Q. The frequency of oscillation of a torsional pendulum is

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Q. The range of a projectile is maximum, when the angle of projection is

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Q. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

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Q. The friction experienced by a body, when in motion, is known as

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Q. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity

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Q. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.

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Q. The coefficient of restitution for elastic bodies is one.

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Q. A smooth cylinder lying on its convex surface remains in __________ equilibrium.

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Q. Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

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Q. Moment of inertia of a circular section about an axis perpendicular to the section is

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Q. The unit of angular acceleration is

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Q. Concurrent forces are those forces whose lines of action

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Q. Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

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Q. According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

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Q. If u1 and u2 are the velocities of two moving bodies in the same direction before impact and v1 and v2 are their velocities after impact, then coefficient of restitution is given by

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Q. The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

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Q. The process of finding out the resultant force is called __________ of forces.

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Q. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

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Q. The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

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