The formula for potential energy depends on the force acting on the two objects. If you let them go, they will move toward each other, doing work in the process. When you are holding two magnets apart they have more potential energy than when they are close together. When you stand at the top of a stairwell you have more potential energy than when you are at the bottom, because the earth can pull you down through the force of gravity, doing work in the process. Potential energy is energy an object has because of its position relative to some other object. A 1816 kg car (2 tons) travelling at 26.8 m/s (60 mph).Īt least one of the values you entered had an incorrect number of significant figures. Remember to use the correct number of significant figures in your answer.ĭ.
Kinetic energy is usually measured in units of Joules (J) one Joule is equal to 1 kg m 2 / s 2.Ĭalculate the kinetic energy in Joules possessed by each of the following objects. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. The earth revolving around the sun, you walking down the street, and molecules moving in space all have kinetic energy. Kinetic energy is energy possessed by an object in motion.
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