Physics/Train Derailment Example.
Dear Prof Steve
Example : Rocket launching is example of Sir Issac Newton's
Third Law of Motion.
1. Train running at 300 km/hr speed may get derailed by applying Sudden Brakes manually by motorman or automated.
2. Automobile viz Car, Truck etc is moving at 150 km/hr speed. Human Beings sitting in the automobile experience a forward push when sudden brakes are applied by the driver.
i.e. Body having mass moving at maximum speed is suddenly brought
to rest by applying resist force (apply brakes).
The above two examples best illustrates which Sir Issac Newton's three Laws of motion, Law of conservation of momentum etc ?.
Awaiting your reply,
Thanks & Regards,
Prashant S Akerkar
Unfortunately, the teachertech link did not work.
The derailment of example 1 is hypothetical. I don't know what anomaly might cause such a hypothetical accident. As I said before, there must have been a serious error in an engineering design (or poor maintenance) for this to happen. Without knowing what went wrong, I can't say what physical law might be involved in the explanation of the accident.
Example 2 is the result of Newton's 1st Law. The Human Beings tend to consider their reference system to be the car. But when their reference system decelerates, it becomes what is known as a non-inertial reference frame. Discussing the experience of Human Beings in such a reference frame often leads to introducing fictitious forces. See the site
I prefer to paraphrase a common way of stating Newton's 1st Law: that the humans in the car continue in motion in a straight line, at the same speed, until acted on by an outside force. The car decelerates, but they do not -- immediately. The outside force in this case would be provided by the seat belt becoming tight and that causes them to also decelerate.
I hope this helps,