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Engineering Mechanics

Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

+9.8 m/s2
+8.9 m/s2
-9.8 m/s2
-8.9 m/s2

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (φ - α)
P = W tan (α - φ)
P = W tan (α + φ)
P = W cos (α + φ)

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Engineering Mechanics
The rate of change of displacement of a body is called

Velocity
None of these
Momentum
Acceleration

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Engineering Mechanics
Coefficient of friction depends upon

None of these
Nature of surface only
Area of contact only
Both (A) and (B)

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Downward at its upper end
Away from the wall at its upper end
Upward at its upper end
Towards the wall at its upper end

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Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's second law of motion
Newton's third law of motion
Newton's first law of motion
None of these

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