|18 Wheeler Jackknife - Inertia|
Explain why you think this happened:___________________________________________________________________________________________________________________________
So What’s Inertia?
Inertia is the tendency* (what something wants to do) for a moving object to stay in constant motion. Until an unbalanced force acts on the object, it will keep moving at the same speed and in the same direction.
If there was no air resistance or gravity, you could throw a ball up from the top of a mountain and it would fly off into space. The ball would continue traveling in a straight line at the same speed until it hit a satellite or planet. In reality, however, moving objects change speed or change direction because they are acted on by unbalanced forces. These opposing forces can include friction, air resistance, and gravity.
Humans experience the Law of Inertia every time they drive in a car. When the driver makes a quick turn or stops suddenly, the passengers' bodies jolt and try to keep moving in the direction the car was just going. Because of inertia, it is very important that passengers in a car wear their seat belts while driving.
Imagine this: You are driving forward in a car at 40 miles per hour. The car is not just going 40 miles per hour – you are too! If the car suddenly stops, your body will want to keep moving since it has inertia. In the case of an accident, seat belts are a force that can keep a passenger from being thrown from the vehicle.