#Physics science lessons how to
#Physics science lessons free

The “center of gravity”, or the “center of mass”, is the point at which an object’s weight is concentrated. “Gravity” is the force that draws us toward the earth, and it’s responsible for making things fall to the ground when they’re thrown up, or dropped from a distance.

#Physics science lessons how to

How to Use Gravity to Tell if an Egg is Cooked So, while it seems to go against reason, the result is actually adhering to the rules of density. Now, the orange has a higher density, because its mass per unit of volume is goes up. When you take away the peel, the air pockets are removed. These air pockets are empty space, or pockets of no mass that, when calculating the total density, serve to decrease the final result. The holes are essentially tiny bubbles of air. An orange peel is highly porous, meaning that it has lots of tiny holes in it. This seems illogical until you consider the nature of density.ĭensity is defined as mass per volume. In fact, what we observe it that peeling an orange makes it sink. It may seem like peeling the orange should allow it to float even better, since by peeling it we’re removing some of its mass and making it lighter. What happens to the orange now? What’s happening? Place the peeled orange back into the jar. Remove the orange from the jar and peel it.Ĥ. It may seem counterintuitive, but in the following experiment we’ll see that peeling an orange actually makes it sink.ģ. It should stand to reason that peeling an orange, and thereby decreasing its mass, should have little or no effect. Objects that are denser than water will sink, while those that are less dense will stay afloat.īecause it’s less dense than water, an unpeeled orange will float. Density is defined as mass per unit of volume, and objects with a higher mass-to-volume ratio have a higher density. When trying to guess if an object will float, it’s useful to take into account the object’s density. The ice forms a layer across the surface of the lake, but the lake remains liquid underneath, allowing the plant and animal life to survive through the winter. Ice is far less dense than liquid water, so any water that freezes rises to the top. So why doesn’t a lake freeze solid from the bottom up? The density of water continues to rise until it reaches freezing, but then its density changes again. In nature, this phenomenon is responsible for a process called “turnover.” The sinking of cooler water and rising of warmer water causes the layers of a lake to mix, allowing nutrients such as oxygen to be dispersed throughout. It turned green because it touched some of the hot water on the way down, cooling it down and making it sink. The cooled water in our experiment sank to the bottom because it had a higher density than the heated water. As the water cools down, its molecules slow down and come closer together. This makes the space between them increase, resulting in a lower density. When water heats up, its molecules vibrate and move around. You CAN influence the world.- What’s happening?Ĭhanging the temperature of water affects its density. Use your knowledge and skills to help others succeed.ĭon't be wasteful protect our environment. Physical Science ContentsĬlick on a button to bookmark or share this page through Twitter, Facebook, email, or other services: If you have any questions, send me an email.

#Physics science lessons free

The purpose of these free online lessons is to give you a start at improving your scientific knowledge to help you become a champion in the field.

Your knowledge and skills in these areas can help you excel in school, advance your career or improve your business. There is a great need for people who understand scientific principles and know how to think logically.

It is also an interesting and exciting subject of value in many walks of life. I believe that knowledge of Physical Science is important for the development of the products we use. I'm Ron Kurtus, and I've always been interested in the Physical Sciences, including teaching the subject at the college level and working in the field in industry. It is concerned with physical properties of objects, as opposed to the study of the characteristics of living things, as done in the Life Sciences. Physical Science consists of the studies of Astronomy, Chemistry, Physics and Earth Science (coming soon).