Category: Physics

Why do pennies sink in water? The reason the pennies sink in water is because of an idea called density. The pennies have more density than the water, and so the pennies sink. Anything with more density than water will sink in water, but other objects that have less density than water will float. What […]

How high will it bounce rebound ratios? Tennis balls: Must rebound approximately 111cm when dropped from 200 cm. Soccer balls: Must rebound approximately 120cm when dropped form 200cm onto a steel plate. Basketballs: Must rebound approximately 53.5 inches when dropped from 72 inches onto a wooden floor. How can you tell how high a ball […]

What is the recommended amount of physical activity for children Topic test? Kids and teens should get 60 minutes or more of moderate to vigorous physical activity daily. Toddlers and preschool children should play actively several times a day. Toddlers should get at least 60 minutes active play every day and preschoolers should have at […]

How can a fully dressed person at rest in the middle of a pond on perfectly frictionless ice get to shore? Now if you’re fully dressed on a frictionless pond at rest and you want to go to shore you have to make a sacrifice. Take off your clothes and throw them in the direction […]

What does a black triangle mean? The Black Triangle. Just as gay men were forced to wear pink triangles in the concentration camps, many lesbians were forced to wear black triangles, which signified that they (like prostitutes and unmarried women of the streets) did not live according to the Nazis’ ideas of correct female behavior. […]

Is April too late for frog spawn? Frogs usually emerge from hibernation at the beginning of March – though in some years they may put in an appearance even earlier – and spawning takes place from March through into April. Why do frogs attach to fish? There are so many that they block up his […]

Are peppered moths still black? By 1970, in some polluted regions nearly 99 percent of peppered moths were now black. Still, scientists were puzzled as to how the black moths first came into being. Until now, that is. Researchers in England have traced the difference between a typica and carbonaria moth to a genetic tweak. […]

What type of parenting is most effective? Authoritative parents have been found to have the most effective parenting style in all sorts of ways: academic, social emotional, and behavioral. Like authoritarian parents, the authoritative parents expect a lot from their children, but also they expect even more from their own behavior. How do I fix […]

How do you find the force of one object on another? Force exerted by an object equals mass times acceleration of that object: F = m * a . When one body exerts a force on a second body, the second body exerts a force equal in magnitude and opposite in direction on the first […]

What happens to the energy when you place a liquid in the freezer? When water freezes it gives up some of the water’s energy. This energy that is given up is the latent heat of freezing. When the water was freezing latent heat of freezing energy was being released. Energy is being transferred even through […]