(a) Define the term force.
(b) What are balanced forces? State the essential condition for a set of forces to be called balanced.
(c) Mention any two observable effects that balanced forces cannot produce on a rigid body.
(d) What are unbalanced forces? State the essential condition for a set of forces to be called unbalanced.
(e) Give one daily-life example each of a situation involving balanced forces and unbalanced forces. In each example, clearly identify the forces acting and comment on the expected motion of the object.