Question

When a block of mass m on a horizontal smooth surface is subjected to a pull acting at an angle
the horizontal, for no motion along the vertical direction, the expression for reaction should be
A) mg
B) mg + F sin q
C) mg - F sin a
D) mg + F cos q​

Answer 1

Answer:

The answer is option C

Explanation:

It is given that force is acting at an angle q with the horizontal. Therefore we need to resolve the force.

mg always acts downwards and normal reaction (R) acts upwards.

Since there is no vertical movement the forces acting along upward and downward directions will cancel each other.

Please refer the image. Hope it helps

Answer 2

Answer:

mg- F sin q

Explanation:

There is no vertical motion

R+F sin q = mg

Therefore

R=mg - F sin q