The Universe Verse is about the creation of the universe, our solar system, and the origin and evolution of life. In his book Dunbar covers the most important basic concepts of physics, chemistry and biology. He covers these important concepts accurately and in comic book form.
I often find myself “craving” certain foods and doubt that I’m the only one. In fact, nearly 100% of women and 70% of men surveyed report the same thing. When we get a craving, we experience an intense urge to consume a specific food and may even go out of our way to obtain this food. In this way, craving is different from both hunger (when we desire any type of food) and liking a food (which is far less intense). But why do we have food cravings? Here are some of the theories...
Irregardless of whether an object is thrown or shot, it will follow the same trajectory: a parabola. Parabolas can be flatter or steeper depending upon the velocity and release angle of the object. It does not matter whether the object is a ball, a cannon ball, or even a bullet. It will follow a parabola which is only slightly distorted due to air friction. In the picture below, you can see some examples of the parabolic trajectory for different angles.
When riding a bicycle or simply sitting outside enjoying a summer breeze, we can feel wind on our faces. The wind we feel is the air flowing around us. This air flow results in air friction and thus air resistance. When we drive a car, there is air friction too, which causes a force pushing the car in the opposite direction of the car’s motion. This force is called drag, or air resistance. To experience this drag, try sticking your hand out of a car that is in motion. While driving a car, this force is the reason why you slow down while coasting on even terrain. While driving, the car’s motor compensates for the drag, which in turn requires gasoline.