Physics - NLM Question with Solution | TestHub
A small block slides frictionlessly down a curved ramp as shown. Which of the arrows CANNOT be the direction of the acceleration of the block at the instant shown? Answer the question considering gravity free space as well as with gravity.
Options:
Answer:
Solution:
The block moves on a curve, so it has a centripetal acceleration toward the centre of the curve (arrow A side) plus a tangential part along the ramp (arrow C side).
With gravity: the acceleration is the net of the normal force (toward the centre) and gravity. A is possible (normal force larger than the weight component), B and C are possible, but D (pure g, straight down) would need zero normal force, which is not the case on the ramp.
Without gravity: only the normal force acts, so the acceleration points toward the centre; D is impossible here too.
Arrow D cannot be the acceleration in either case. Answer: (D).
