#### • Class 11 Physics Demo

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#### • kinetic and potential energy formula

Question:Help I need 3 Examples Of Potential Energy, and 5 Examples of Kinetic.

Answers:here are examples of potential: - a roller coaster on the top of a hill track. - a rocket ready for takeoff. - a snowball on top of a snowy mountain. here are examples of kinetic: - a group of people pushing a car. - a team of sled dogs pulling a sled. - a bunch of bulldozers pushing a large boulder. - kids on a see-saw. - people moving furniture.

Question:So, our physics class did a little activity where we made roller coasters, and then we got a question sheet on the activity. I got all of the questions but one. The question is: What force is acting on your roller coaster to change energy from potential to kinetic? I was thinking either gravity or friction or something, but I don't know. Could you explain it so I can understand it for later? Thanks guys

Answers:Gravity is the force acting on changing potential energy to kinetic in your setup. kinetic energy = the negative change in potential, and since gravity is the force applied to cause the change in potential, therefore it is also the force that changes kinetic energy. Friction changes energy into heat, so it does not apply to the question your teacher asked.

Question:Which ones of these listed are examples of kinetic energy? 1. A reservoir of water behind a hydroelectric dam has more _____ energy. 2. A tree that is kept from toppling over by leaning on another tree has more _____ energy. 3. A marble rolling along an level surface has more _____ energy. 4. A car parked at the top of a hill has more _____ energy. 5. A space ship moving through space far from any planet has more _____ energy. 6. A tightly wound spring has more _____ energy. 7. A bullet fired in space has more _____ energy.

Answers:Answer: 3, 5 & 7. Kinetic energy is energy of motion. The kinetic energy of an object is the energy it possesses because of its motion. The kinetic energy* of a point mass m is given by KE = 1/2mv2 Kinetic energy is an expression of the fact that a moving object can do work on anything it hits; it quantifies the amount of work the object could do as a result of its motion. The total mechanical energy of an object is the sum of its kinetic energy and potential energy. Dr. H

Question:Which is an example of Kinetic energy and which is an example of potential energy 1) Flammability of paper 2) Boiling of liquid nitrogen 3) toxicity of nerve gas 4) gasoline burning

Answers:Potential energy is stored energy, kinetic is released energy. 1) Potential 2) Kinetic 3) Potential 4) Kinetic Hope this helps.