PHYS 1010Q Lecture 7: Energy, Work, Work and Kinetic Energy
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Example: a 60-kg passenger riding in a car involved in a 20 m/s (45mi/h) collision with a concrete barrier. If the stopping time is 0. 25 s, what is the force exerted by the seat beat and shoulder strap on the passenger? p=m v= f t. The principle of energy conservation says that the total energy of an isolated system does not change. It can be converted from one type of energy to another, but the total amount of energy stays the same. It is one of the most fundamental and far reaching concepts for how physics looks at the universe around us. This is the energy associated with the motion of an object. The kinetic energy is equal to one-half of the product of the mass with the square of the speed. Example: the mks unit of energy is the joule where 1 j=1 kg m /s .
