Applied Mechanics and Graphic Statics
A sphere is resting on two planes BA and BC which are inclined at 45° and 60° respectively with the horizontal. The reaction on the plane BA will be

None of these
Equal to that on BC
Less than that on BC
More than that of BC

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Friction force acting when the body is just about to move
Friction force acting when the body is in motion
Angle between normal reaction and resultant of normal reaction and limiting friction
Ratio of limiting friction and normal reaction

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Applied Mechanics and Graphic Statics
‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = v₁ - v₂/u₂ + u₁
e = v₁ - v₂/u₂ - u₁
e = v₂ - v₁/u₁ - u₂
e = u₂ - u₁/v₁ - v₂

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