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Transcript
There are 2 forms of energy… Kinetic Energy Potential Energy We already know that Kinetic Energy is the energy Of motion. But what if something is Not moving? Potential energy is stored Energy. One kind of potential energy is Energy due to its position On earth. This is gravitational Potential energy. PE = mgh If Cal lifts a 2 kg textbook from The floor to a shelf 2.1 m above The floor. What is the book’s Potential energy relative to the Floor? What is the potential energy Relative to his head if he is 1.65 m tall? 41.2 J 8.82J Elastic potential energy is the Potential energy of a Stretched or compressed spring. The spring constant (k) is a Parameter that expresses how Resistant a spring is to being Compressed or stretched. PEelastic = ½ kx2 The staples inside a stapler are Kept in place with a spring with a Relaxed length of 0.115m. If the Spring constant is 51 N/m, how Much PE is stored when the Spring is stretched to 0.150m? 0.031 J Mechanical Energy is the sum Of kinetic energy and all forms Of potential energy. ME = KE + ΣPE Einstein recognized yet another Form of potential energy: Mass Itself! He said that mass, by its very Nature, is just one manifestation Of Energy. E= 2 mc The law of conservation of Energy states that energy cannot Be created or destroyed, only Transferred. MEi = MEf The law of conservation of Matter states that matter Cannot be created not destroyed. As far as you are allowed to know. A large chunk of ice with a mass Of 15 kg falls from a roof 8 m Above the ground. Find the Kinetic Energy of the ice when It reaches the ground. What is The speed of the ice when it Reaches the ground? 1180 J 12.5 m/s An elastic collision is a Collision in which the total Momentum and the total kinetic Energy remain constant. m1v1i + m2v2i = m1v1f + m2v2f 2 ½m1v1i + 2 ½m2v2i ½m1v1f + ½m2v2f 2 = 2 A perfectly inelastic collision is a Collision in which two objects Stick together and move with A common velocity after Colliding. In an elastic collision, the kinetic Energy is slightly decreased. Usually it is converted to Thermal and sound energy.
