7
Question Question 6(i)
(a) A force applied on a
I. rigid body
II. non-rigid body
How does the effect of force differ in the two cases?
(b) Give one example of couple force.
(a) (i) Rigid body — A force when applied on a rigid object does not change the inter-spacing between it's constituent particles and therefore it does not change the dimensions of the object, but causes only motion in it.
(ii) Non-rigid body — A force when applied on a non-rigid object, changes the inter-spacing between it's constituent particles and therefore causes a change in it's dimensions and can also produce motion in it.
(b) Two equal and opposite parallel forces, not acting along the same line form a couple. E.g. tightening the cap of a bottle.