Question

1. which of the following is an example of unbalanced forces? a) a book resting on a desk b) two students pulling a rope with equal force in opposite directions c) a soccer ball rolling after being kicked d) a magnet stuck to a refrigerator

Explanation:

• Option a: A book resting on a desk has balanced forces (gravity and normal force are equal and opposite), so it's not unbalanced.
• Option b: Two students pulling a rope with equal force in opposite directions result in balanced forces (net force is zero), so it's not unbalanced.
• Option c: A soccer ball rolling after being kicked has unbalanced forces because the force from the kick is no longer balanced by an equal opposing force, causing it to accelerate (change velocity) as it rolls (friction also acts, but overall net force is not zero).
• Option d: A magnet stuck to a refrigerator has balanced forces (magnetic force and the force of gravity/normal force balance), so it's not unbalanced.

Answer:

c) A soccer ball rolling after being kicked