Example 1 (A ball rolling down a hill will continue to roll unless friction or another force stops it):
This example demonstrates Newton's First Law, also known as the law of inertia. According to this law, an object at rest will remain at rest and an object in motion will continue moving in a straight line at a constant velocity unless acted upon by an external force.
In the case of a ball rolling down a hill, the initial force is provided either by pushing the ball or by the force of gravity acting on it. Once the ball is set in motion, it will keep rolling due to its inertia until it encounters friction or any other force that acts against its motion. Friction can come into play when the ball rolls on the ground or surface of the hill, eventually slowing it down and bringing it to a stop.
However, in the absence of any friction or other forces, the ball would continue rolling indefinitely. This demonstrates Newton's First Law, as the ball wants to maintain its state of motion due to inertia.
3. Choose one example above and explain how it demonstrates Newton’s First Law.
Example 1: A ball rolling down a hill will continue to roll unless friction or another force stops it.
Example 2: Pushing a cart. It is easier to push an empty cart in a supermarket than a loaded one, and more mass requires more acceleration.
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