Thank you Julie Bean, Motion Expert

Today in class we discussed Newton's First Law of Motion, inertia. Immediately, I thought back to learning about inertia in fifth grade. We often watched videos from the television show Science Court,  which I enjoyed. So when I was assigned the task of finding a resource that helped to explain Newton's First Law, I knew exactly what I would pick. The beginning of the episode sets up the characters and the plot, but aren't really essential parts to the lesson. Starting at minute 6:56, there are various basic explanations of why inertia works the way that it does. In the video, motion expert Julie Bean explains that objects in motion like to stay in motion and objects at rest like to stay at rest. Like the video we watched in class today, Julie Bean demonstrates how the trick of pulling a tablecloth out from underneath dishes is an example of inertia. She also mentions that the reason seatbelts are necessary in cars in due to inertia. While you are in a car, your body is moving just as fast as the car is. Therefore, if the car were to stop and you were not wearing a seatbelt, you would fly out of the windshield because the law states that your body will stay in motion. She also addresses friction. Another girl in the court room demonstrates how a skateboard only stops because of the friction between the board and floor as well as between the board and the air. Julie Bean explains how if the stenographer were to go into space with a toothbrush and simply let it go, the toothbrush would be suspended in space forever. However, were the stenographer to push the toothbrush it would float through space forever. Her examples relate back to the Science Court's original case of why a decorative ball on a wire attached to the back of a bicycle (called a baad) would hit someone on the back of their head when the bicycle stopped.

The examples in the Science Court video helped me understand the first example of inertia that we watched in class today. Ms. Lawrence pushed a cart containing a small ball down a track. When the cart passed a sensor on the track, the ball popped up and fell directly back into the cart. The video below shows a man demonstrating what Ms. Lawrence showed us in class today. Thanks to the explanations in class and the episode of Science Court that I watched, I understand that the ball fell back into the moving cart because it was still moving at the same speed as the cart, due to inertia.