Physics

A:

Metals conduct heat well for two reasons: metal ions pack very closely together in their molecular lattice, and electrons drifting through the metal carry kinetic energy around the lattice. The result is a quick elevation in particle motion that is expressed through heat energy. This conductivity is one reason why one rarely sees metal playground equipment anymore — although the slides go a lot faster than plastic ones, sitting on a slide on a hot summer afternoon is often quite painful.

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  • Why Does Rubbing Your Hands Together Make Them Warmer?

    Q: Why Does Rubbing Your Hands Together Make Them Warmer?

    A: Friction causes the hands to warm up when rubbed together. The greater the amount of friction between two objects is, the more heat is generated.
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  • How Are Mass and Weight Related to Each Other?

    Q: How Are Mass and Weight Related to Each Other?

    A: Mass and weight are closely related because mass affects the weight of an object experiencing the effects of gravity. Weight is the measure of the force of gravity on an object's mass, while mass is the measure of how much matter there is in an object.
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  • What Is the Purpose of a Windmill?

    Q: What Is the Purpose of a Windmill?

    A: A windmill uses wind power to create rotational energy for the use in mills, pumps and presses. In the Netherlands, where windmills became important for local economies, they were used to make boards, paint, oil, paper and bread.
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  • What Were the Contributions of Archimedes to the Field of Physics?

    Q: What Were the Contributions of Archimedes to the Field of Physics?

    A: The first-century inventor and scientist Archimedes is remembered by physicists as the originator of the principles of mechanics, buoyancy, the lever and the pulley, according to Famousscientists.org. Perhaps his best-known contribution to physics is his discovery of the principle of displacement, which states that objects displace a volume of water equal to their own weight.
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  • What Is the Formula for Tension in Physics?

    Q: What Is the Formula for Tension in Physics?

    A: In physics, the tension on a suspended object said to be equal to the weight of the object plus or minus the mass of the object times the acceleration acting on it. In other words, this is the weight of the object plus or minus the force on it, depending on the direction in which the force is acting.
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  • What Are Examples of Noncontact Forces?

    Q: What Are Examples of Noncontact Forces?

    A: Electricity, gravity and magnetism are all examples of non contact forces. A force is anything that can cause a physical change in an object.
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  • What Is the Difference Between Kinetic and Potential Energy?

    Q: What Is the Difference Between Kinetic and Potential Energy?

    A: Kinetic energy is contained in a moving object, while potential energy exists in a stored form. Potential energy can be changed into kinetic energy. Potential energy is ready for release, while kinetic energy is already doing work. The property of a body determines the type of energy it contains.
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  • How Does Gravity Affect Humans?

    Q: How Does Gravity Affect Humans?

    A: Humans evolved with gravity, and gravity affects human physiology and general health. Studies show that weightlessness has a number of negative health effects. Finding ways to mitigate these dangers is essential for long-distance space travel.
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  • What Are Some Good Lab Experiments That Explain Centripetal Force?

    Q: What Are Some Good Lab Experiments That Explain Centripetal Force?

    A: One good experiment that explains centripetal force is the spinning penny. A penny is put inside a balloon, and the balloon is filled with air. Then, the balloon is swirled around until the penny rolls around inside of the balloon. The penny continues to spin even after the swirling stops.
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  • What Is the Difference Between an Atomic Bomb and a Nuclear Bomb?

    Q: What Is the Difference Between an Atomic Bomb and a Nuclear Bomb?

    A: Although both atomic and nuclear bombs derive their immense power from reactions that take place in the nucleus of the atom, they do so in different ways. As the terms are most commonly used, an atomic bomb derives its energy from fission, or splitting atoms, while a nuclear device, or "H-bomb," is driven by fusion.
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  • Does Light Always Travel at Light Speed?

    Q: Does Light Always Travel at Light Speed?

    A: Light typically travels at 186,000 miles per second, but scientists have found a way to slow it down to 38 miles per hour. A team at the Rowland Institute for Science has found a new state of matter to help slow light down. Sodium atoms were cooled almost to absolute zero, which is 459.67 degrees Fahrenheit below zero. That’s lowest temperature theoretically possible. They then shot a laser through the extremely cold sodium atoms, which acted like “optical molasses” to slow down the beam of light.
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  • How Does a Fulcrum Work?

    Q: How Does a Fulcrum Work?

    A: A fulcrum is the fixed support or pivot point for a lever, which is a simple machine used to overcome resistance. The lever is a stiff rod or bar, and the location of the fulcrum determines the class of the lever. Levers are useful to increase force, increase speed or change direction of a force, according to HowStuffWorks.
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  • What Are the Parts and Functions of a Theodolite?

    Q: What Are the Parts and Functions of a Theodolite?

    A: A thedolite is an instrument used to measure horizontal and vertical distances using lenses and lines. They include several components, such as a telescope, a leveling mechanism, a tripod and a compass. Theodolites are used for surveying and construction to obtain precise readings of landforms so construction projects remain level and plumb with the ground.
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  • What Are the Laws of Attraction and Repulsion?

    Q: What Are the Laws of Attraction and Repulsion?

    A: The Law of Attraction is the belief that a person's thoughts attract specific things, people and situations into his life. The Law of Repulsion is the belief that the more a person thinks about what he does not want, the more he attracts what he does want. According to SelfGrowth.com, both beliefs support the idea that what a person thinks about, negative or positive, can manifest into reality.
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  • Why Does a Bouncy Ball Bounce so High?

    Q: Why Does a Bouncy Ball Bounce so High?

    A: Bouncy balls bounce high because the material of the ball is extremely elastic and can convert the kinetic energy from the fall into potential energy and back again with very little loss in momentum. Bouncy balls are used in many physics classrooms because they aptly demonstrate conservation of momentum through a highly elastic collision.
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  • Why Do Flames Go Upwards?

    Q: Why Do Flames Go Upwards?

    A: Visible flames are hot gases emitting light, which naturally rises because it is hotter (and therefore less dense) than the air around it. These hot gases are byproducts of the chemical reaction of combustion, or burning.
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  • What Is the Definition of Resonant Frequency?

    Q: What Is the Definition of Resonant Frequency?

    A: Resonance frequencies are the natural frequencies at which it is easiest to get an object to vibrate. While setting up vibrations at other frequencies is possible, they require much more energy and constant input to maintain than a resonance frequency. Most objects have several resonance frequencies, and this property must be taken into account because of their positive, as with musical instruments, or negative, as with bridges, effects.
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  • What Is a Venturi Meter?

    Q: What Is a Venturi Meter?

    A: A Venturi meter is a flow measurement device, commonly utilized in the water supply industry. A Venturi meter specifically uses a converging section of pipe to increase flow velocity. A corresponding reduction in pressure permits a determination of the flow rate.
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  • What Is a Compound Pulley?

    Q: What Is a Compound Pulley?

    A: A compound pulley, sometimes referred to as a block-and-tackle system, is a mechanical arrangement of pulleys that permits a trade-off of applied force for distance, according to HowStuffWorks. By slinging rope over and through a system of wheels, a compound pulley permits weights to be lifted and pulled with the application of relatively little force, saving energy and reducing the power needed to accomplish work.
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  • What Are Some Real Life Examples of Series Circuits?

    Q: What Are Some Real Life Examples of Series Circuits?

    A: The most common series circuit in everyday life is the light switch. A series circuit is a loop that is completed with a switch connection sending electricity through the loop.
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  • What Is Eddy Current?

    Q: What Is Eddy Current?

    A: An eddy current is an electrical current induced in a piece of metal due to the relative motion of a nearby magnet. Any time a magnet passes a metallic object, its magnetic field induces an electric current, which swirls around near the surface of the metal like an eddy in a river. This electric current creates its own magnetic field, which opposes the motion of the magnet.
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