Does Temperature Affect the Bounce of a Ball? | Wonderopolis Do you know what soccer, football, baseball, basketball, tennis, and golf all have in common? They all feature a ball as a primary part of play. And another key part of game play in each of these sports is exactly how the ball bounces. Even if you’re not into sports, you’ve probably played with bouncy balls from time to time. To start, let’s think about a tennis ball. Like many other types of balls, tennis balls have a hollow center filled with air. When a tennis ball hits the ground, the ground exerts a force on the ball, pressing upward and pushing the bottom of the ball inward. How high a particular tennis ball will bounce depends upon the pressure of the air inside the ball. Since we’re interested in temperature, we will assume that the density and the constant remain unchanged. As the gas molecules expand, their energy increases and they bounce around faster inside the ball. Likewise, a lower temperature will lead to a lower pressure.
Home A type of eligibility criteria that indicates whether people who do not have the condition/disease being studied can participate in that clinical study.An arm type in which a group of participants receives an intervention/treatment considered to be effective (or active) by health care providers.An unfavorable change in the health of a participant, including abnormal laboratory findings, that happens during a clinical study or within a certain amount of time after the study has ended. This change may or may not be caused by the intervention/treatment being studied.A type of eligibility criteria that indicates the age a person must be to participate in a clinical study. This may be indicated by a specific age or the following age groups:The age groups are: Child (birth-17)Adult (18-65)Senior (66+)A method used to assign participants to an arm of a clinical study.
The Vaccine War: The Growing Debate Over Vaccine Safety Vaccines have changed the world, largely eradicating a series of terrible diseases, from smallpox to polio to diphtheria, and likely adding decades to most of our life spans. But despite the gains -- and numerous scientific studies indicating vaccine safety -- a growing movement of parents remains fearful of vaccines. And in some American communities, significant numbers of parents have been rejecting vaccines altogether, raising new concerns about the return of vaccine-preventable diseases like measles and whooping cough. Nowhere has this debate grown more heated than in Ashland, Ore. -- an area that FRONTLINE learns is of high concern to the Centers for Disease Control and Prevention. In this video excerpt from The Vaccine War, consider differing perspectives among doctors, parents and public health officials on the risks and benefits of vaccines: Video Segment Themes:
MrGym.com - Home PALS - Task with Student Directions Task: At this station, you will be establishing the conditions under which a new experimental drug will be tested. The drug ALAMAIN has been developed by the Gentronic Drug Company to lower blood pressure in people whose blood pressure is too high. The drug has been thoroughly tested on animals with positive results. As chief research scientist at the Human Improvement Laboratory (HIL) you have been assigned the task of developing the human testing program for the new high blood pressure drug Alamain. Once the list of participants has been created, using complete sentences explain how they will be selected to be a member of either the experimental or the control group. Using complete sentences, explain the characteristics of what must be given to the control group in place of the experimental drug to act as a placebo , and why the participants should be given this substance.
How bacteria "talk" - Bonnie Bassler Many species of bacteria use quorum sensing to coordinate gene expression according to the density of their local population. Vibrio fischeri has bioluminescent properties and is found predominantly in symbiosis with various marine animals, such as the bobtail squid. Bobtail squid have a symbiotic relationship with bioluminescent bacteria, which inhabit a special light organ in the squid's mantle. Luminous bacteria are the most widely distributed light-emitting organisms with the majority existing in seawater and the remainder living in the terrestrial or freshwater environment. Virulence is the degree of pathogenicity within a group or species of parasites as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. Molecular biology chiefly concerns itself with understanding the interactions between the various systems of a cell.
Seasonal Kids Yoga Lesson Plans - Kids Yoga Stories Yoga for kids is a great way to celebrate the various seasons throughout the year. Seasonal yoga gets children learning, moving, and having fun! The following lesson plans are designed for children ages three to eight, but they could be adapted for younger or older children. Each session can be between fifteen to forty-five minutes, depending on the needs and requirements of the children. The intention of these seasonal yoga lesson plans is to learn about various seasons through movement. In preparation for your seasonal yoga experience, feel free to gather props and information about each season of winter, spring, summer, and autumn. To set up your Seasonal Yoga experience for success: Enjoy our free seasonal yoga lesson plans for kids by clicking on the images or links below! Winter Activities Winter Olympics Yoga Winter Sports Spring Spring Yoga Story Summer Beach AutumnAutumn Coloring Page Looking for more kids yoga sequences? Buy Luke’s Beach Day for your summer yoga session: (Visited 272 times)
Cell Signals Home DNA Learning Center Preparing students and families to thrive in the gene age 3-D Animation Library Cell Signals Journey inside a cell as you follow proteins and learn about cellular interactions. This 3-D animation brings to life the inner workings of a fibroblast cell as it responds to external signals. Duration: 14 minutes, 15 seconds Transcript: (00:36) Hey wait up for me. (00:55) Your body is an incredible living system made up of billions of cells. (01:20) Now we've arrived at the wound site. (02:45) Fibroblasts, like all your cells, have a fluid, outer membrane that regulates the flow of molecules in and out. (03:46) Beneath the cell membrane, you see the grey receptor ends surrounded by pink fibers – these structures help to give the cell its shape – and a range of messenger proteins that will carry the signal through the cytoplasm. (04:25) Now we'll watch the action again from our position in the cell's cytoplasm. Download Choose a 3-D animation by name: Student Summer Camps
How do cancer cells behave differently from healthy ones? - George Zaidan George Zaidan is a card-carrying nerd and lifelong teacher. He scours the internet for the most intriguing scientific papers and then translates them into English for his video blog, Pocket Science. He has written and hosted for The Weather Channel, worked on Alton Brown's science cooking opus Good Eats, and has produced science videos for New Scientist and Earth Magazines. George is a Fellow of the Institute for Education, an avid golfer, and a graduate of MIT. Most of the time, when a cell in our bodies divides, each new cell carries a complete set of chromosomes. A hepatocyte is a cell of the main tissue of the liver. Keratin is a family of fibrous structural proteins. Chemotherapy is a drug treatment that uses powerful chemicals to kill fast-growing cells in your body. The American Cancer Society (ACS) is a nationwide voluntary health organization dedicated to eliminating cancer. When cancer treatment includes chemotherapy, patients have many questions.