![]() ![]() However, since it is fired upwards it gains height causing its kinetic store to decrease because it slows down but its gravitational potential store increases.Įventually it reaches its highest point when its kinetic store is empty (because it stops moving for a moment) but its potential store is at its maximum.Īt the highest point the amount of energy in its potential store should equal that in its original elastic store. Then the rubber and ball is released causing the ball to begin to move rapidly, so it suddenly has a large kinetic store. The rubber catapult is pulled backwards producing a full elastic energy store, Store 1 Example 3Ĭonsider a small ball being fired vertically upwards from a catapult? Sometimes energy can transfer into two (or more) stores. The total of the two stores should always add up to the same amount ie to the inital amount in the kinetic store or the final amount in the potential store. But when the ball reaches its highest point, its kinetic store is empty and its gravitational potential store is at its fullest.ģ. Note: 1.the kinetic store of the ball is fullest at the start just when the ball starts to move at this time its gravitational potential store is empty.Ģ. ![]() ![]() So the overall energy transfer is from the kinetic store of the ball to the gravitational potential store of the ball. As it travels upwards its gravitational potential store gradually fills BUT because it rises slower and slower its kinetic store gradually empties. It starts off with a large kinetic store as soon as it leaves the persons hand. Example 1Ī good example of an energy transfer is that described in Question 5 above:Ī battery powered toy car moves along the floor-Įnergy flows from a chemical store (ie from its battery) to a kinetic store (the moving car).Īn easier way to illustrate this is to draw boxes to show the energy stores, and an arrow to show the flow of energy. So, it will only transfer when there are two or more energy stores in an energy system (unless the energy stores are all identical in every way eg two thermal stores at exactly the same temperature). It will only transfer between energy stores it won't move from one energy store to something that isn't an energy store. CheckĮnergy will transfer or flow between energy stores. A battery powered toy car moves along the floor:Įnergy flows from a store to a store. As it nears the bottom of this height, most of the energy will have moved to a store. At its highest point (235 ft), the train of the Big One roller coaster at Blackpool stores a large amount of energy. Eventually the around the bottle would gain the same amount of energy but it would be very. A hot-water bottle is a good example of a store of energy. The energy could be stored for as long as the food or the fuel or the battery exist.ġ. Eventually the air around the hot object gains all of the energy, so it becomes an energy store, though its energy would be very spread out, wouldn't it?Ī Chemical store - energy fills the bonds between the chemical elements in food, fuel or batteries. Thermal (or Internal) store - energy fills a hot object, for as long as the object remains hot. Quite simply, energy stores are ways in which energy can be stored there are many of them:Ī Gravitational Potential store - energy fills an object when it is raised up against the pull of gravity, for as long as the object is raised up.Ī Kinetic store - energy fills a moving object, for as long as the object moves.Īn Elastic Potential store - energy fills a stretched elastic band or spring, for as long as they are stretched (or compressed). It has been known for quite a long time that energy is "one thing" but that it is stored in many different ways and that it flows from one store to another and in doing so we can make it do something good and useful, something we call work.īut before we get ahead of ourselves, what do we mean by energy stores? ![]()
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