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Acceleration
Acceleration is the rate of change of velocity. At any point on a speed-time graph, the magnitude of the acceleration is given by the slope of the tangent to the curve at that point. In physics, acceleration is defined as the rate of change of velocity, or as the second derivative of position (with respect to time). It is then a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² (m·s-2). The term "acceleration" generally refers to the change in instantaneous velocity. In common speech, the term acceleration is only used for an increase in speed; a decrease in speed is called deceleration. In physics, any increase or decrease in speed is referred to as acceleration and similarly, motion in a circle at constant speed is also an acceleration, since the direction component of the velocity is changing. See also Newton's Laws of Motion. final version: 16.03.2008 21:12, |
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Joule
The joule (symbol: J) is the SI unit of energy. It was named after James Prescott Joule for his work on the relationship between heat, electricity and mechanical work. One joule is the work done, or energy expended, by a force of one newton moving an object one meter along the direction of the force. This quantity is also denoted as a Newton-meter with the symbol N·m. Note that torque also has the same units as work, but the quantities are not identical. In elementary units: 1J = 1kg. m²/s² One joule is also: * The work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt, with the symbol C·V. * The work done to produce power of one watt continuously for one second; or one watt second (compare kilowatt-hour), with the symbol W·s. final version: 28.03.2008 16:39, |
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Trajectory of a projectile
In physics, the ballistic trajectory of a projectile is the path that a thrown object will take under the action of gravity, neglecting all other forces, such as friction from air resistance, or propulsion. This article provides a list of methods for calculating the trajectory of a projectile under the influence of Earth's gravity. final version: 30.11.2006 19:01, |
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