Engineering Mechanics
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

None of these
Equal to
Less than
Greater than

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Engineering Mechanics
The moment of a force

Is the turning effect produced by a force, on the body, on which it acts
All of these
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

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Engineering Mechanics
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

The change in momentum suffered by rubber ball is less than the lead ball
Both the balls undergo an equal change in momentum
None of these
The change in momentum suffered by rubber ball is more than the lead ball

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