Physics

A:

The north and south poles, often called the negative and positive sides, of a magnet are determined by using the directional properties of magnets. The north pole of the magnet is attracted to Earth's geographical north pole, and the south pole is attracted to Earth's geographical south pole.

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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 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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  • 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 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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  • 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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  • 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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  • 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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  • How do you magnetize metal?

    Q: How do you magnetize metal?

    A: Metals and materials that contain metal can be magnetized either temporarily or permanently. Creating a temporarily magnetized metal can be achieved by bringing that metal in close contact with an already magnetized metal or by charging it with an electrical current. Permanent magnetization can occur by rubbing the metal with the poles of already magnetized materials or by hitting a metal while it is in a magnetic field.
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  • What are the physics of a megaphone?

    Q: What are the physics of a megaphone?

    A: A megaphone directs or funnels the voice to a specific direction, and it also regulates the distribution of sound waves from the mouth to the open medium. The secret behind the workings of a megaphone is in its shape.
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  • How do wind turbines work?

    Q: How do wind turbines work?

    A: Wind turbines turn the kinetic energy of the wind into mechanical energy and then electricity through the use of a shaft and a gearbox that power an internal generator. Sensors in the wind turbine allow it to turn and adjust its angle for optimum wind capture. Electricity from the turbine generator goes to a substation, where it is converted to a high voltage capable of transportation through power lines.
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  • How does a laser diode work?

    Q: How does a laser diode work?

    A: A laser diode works by having a p-n junction that is powered by the injection of electric current. The active medium for these lasers is a semiconductor similar to what is found in light-emitting diodes.
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  • How can I determine the positive and negative sides of a magnet?

    Q: How can I determine the positive and negative sides of a magnet?

    A: The north and south poles, often called the negative and positive sides, of a magnet are determined by using the directional properties of magnets. The north pole of the magnet is attracted to Earth's geographical north pole, and the south pole is attracted to Earth's geographical south pole.
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  • What are the types of acceleration?

    Q: What are the types of acceleration?

    A: There are three types of acceleration in general: absolute acceleration, negative acceleration and acceleration due to change in direction. Acceleration is defined as the rate of change of velocity.
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