Physics - NLM Question with Solution | TestHub
A Trolley moving on a smooth horizontal surface in straight line uniformly [see figure (a)]; with constant acceleration [see figure (b)] Constant retardation [see figure (c)]. The total contact force on the block is given by
Options:
Answer:
Solution:
The total contact force on the block is the vector sum of the normal reaction (vertical) and friction (horizontal).
Case (a) uniform velocity: no horizontal force is needed, so the contact force is purely vertical - matches figure (ii).
Case (b) constant acceleration: friction must act in the forward direction, tilting the contact force forward from the vertical - matches figure (i).
Case (c) constant retardation: friction acts backward, tilting the contact force backward - matches figure (iii).
Matching: (a)-ii, (b)-i, (c)-iii. Correct option: (C).
