Answer:
The Law of Inertia, a principle from Newton’s First Law of Motion, states that an object will remain at rest or in uniform motion unless acted upon by an external force. Here’s how this law is evident in each scenario:
1. A Ball Rolling on the Ground:
- Inertia in Action: Once a ball is rolling, it will continue to roll in a straight line at a constant speed unless acted upon by an external force, such as friction or a collision. The ball’s tendency to keep moving exemplifies inertia.
2. Shaking a Bottle of Ketchup:
- Inertia and External Force: When you shake the bottle, you apply an external force that overcomes the ketchup’s inertia, which resists the change in its state of rest. Without shaking, the ketchup remains stationary due to its inertia.
3. Marathoner Running Beyond the Finish Line:
- Inertia and Momentum: After crossing the finish line, a marathoner will continue to run forward due to inertia, even though they have passed the endpoint. Their body’s motion continues until an external force, like friction with the ground or their own effort to stop, acts to bring them to a halt.
Explanation:
In each case, inertia explains how objects resist changes to their state of motion or rest, demonstrating the foundational principle of Newton’s First Law of Motion.
