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 more 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 less than the lead ball

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the horizontal components of all the forces should be zero
All of these
Algebraic sum of moments of all the forces about any point should be zero
Algebraic sum of the vertical components of all the forces should be zero

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

Do not meet at one point and their lines of action do not lie on the same plane
Do not meet at one point but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
None of these

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Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point in their plane is zero
Their lines of action are at equal distances
Their algebraic sum is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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