First slide

Mechanical equilibrium force cases

Question

Identify the correct order in which the value of normal reaction increases, (object is placed on rough horizontal surface)
i) The object is pushed with the force F at an angle 'θ' with horizontal
ii) The object is pulled with the force F at an angle 'θ' with horizontal
iii) The object is pushed down with the force F normally
iv) The object pulled up with the force F normally

Moderate

A

i, ii, iii, iv
B

iv, ii, i, iii
C

i, iii, ii, iv
D

ii, iv, iii, i

Solution

In statement (i) , N = (mg + Fsinθ)
In statement (ii) , N= (mg-Fsinθ)
In statement (iii) , N = (mg+F)
In statement (iv) , N = (mg-F)

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