Question

(a) List three possible effects that can be produced by a force.
(b) Identify the nature of net force acting in the following cases :
(i) A child is not able to move a chair despite applying lot of force.
(ii) A ball is rolling with uniform velocity.
(iii)A ball is rolling with non-uniform velocity.

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

 (a) (i) Change in shape.
 (ii) Change in position.
(iii)Change in speed.
 (b) (i) Net force is zero.
 (ii) Net force is (+ ve)
(iii) Net force is (- ve)