Question

(a) Ashima plotted a graph of time versus position as shown in the following figure. Is such time variation of position observed in nature ? Give reason for your answer
(b) Is it possible that a body moves horizontally with an acceleration in vertical direction ?

CBSE Class IX Science LA (5 Marks)

Answer 1

(a) No, such a time variation of position as plotted by Ashima is not observed in nature. This is because :

(i)     In the graph, time increases first and then decreases. Backward flow of time is not possible.

(ii) An object cannot be present at two different positions, at a particular instant of time.

(b) Yes, it is possible. For a body in uniform circular motion, the velocity of the body and the acceleration are always at right angles to each other. When a stone tied to a string is swirled horizontally, the gravitational acceleration acts vertically downwards.