Final answer:
One activity to demonstrate Newton's first law of motion is the ball rolling on a flat surface, while a balloon rocket can demonstrate Newton's third law of motion.
Step-by-step explanation:
(a) Newton's first law of motion: One activity to demonstrate Newton's first law of motion is the classic example of a ball rolling on a flat surface. When a ball is given a push or a force is applied to it, it will keep moving in a straight line at a constant speed unless acted upon by an external force. This is an example of Newton's first law, also known as the law of inertia.
(b) Newton's third law: Another activity to demonstrate Newton's third law of motion is the use of a balloon rocket. When a balloon is inflated and released, the air rushing out of one end creates a backward force that propels the balloon forward. This is an example of Newton's third law, which states that for every action, there is an equal and opposite reaction.
Learn more about Newton's laws of motion