Textbook Guide Physics: Conservative Force, Radar Gun, Net Force
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PHY131H1 Full Course Notes
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Energy is a scalar quantity associated with the state (or condition) of one or more object. Energy is a number that we associate with a system of one or more objects. Kinetic energy k is energy associated with the state of motion of an object. The faster the object moves, the greater is its kinetic energy. When the object is stationary, its kinetic energy is zero. For an object of mass m whose speed v is well below the speed of light. Work w is energy transferred to or from an object by means of a force acting on the object. Energy transferred to the object is positive work, and energy transferred from the object is negative work. To calculate the work a force does on an object as the object moves through some displacement, we use only the force component along the object"s displacement. The force component perpendicular to the displacement does zero work. (e2)