NAEST 2020 | Screening Test Previous Year Question: Moving Fingers Under a Scale – Friction & #NAEST

NAEST 2020 Screening Test | Previous Year Question – Moving Fingers Under a Scale (Rotational Mechanics)

Question 1:
A person tries to slide both fingers simultaneously under a scale. When the finger on the left slides, the finger on the right remains at rest. In this situation:

The frictional force on the scale by the left finger is f1
The frictional force on the scale by the right finger is f2

Choose the correct option:
a. f1 = f2
b. f1 is greater than f2
c. f1 is less than f2
d. f1 = f2 = 0

Question 2:
The directions of the frictional forces f1 and f2 are:
a. Both towards right
b. Both towards left
c. Towards left and towards right respectively
d. Towards right and towards left respectively

Question 3:
Let N1 be the normal force by the left finger on the scale and N2 be that by the right finger. The mass of the scale is M. Choose the correct option:
a. N1 = N2
b. N1 = N2 = Mg / 2
c. N1 is greater than N2
d. N1 is less than N2

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