Potential come Kinetic energyPrinciples of power TransferObjective: The target of this demonstration is to investigate the values of energy transfer. Time: 25-30 minutesReview of scientific PrinciplesThe legislation of preservation of energy states that energy can neither be developed nor destroyed yet can be adjusted into various forms. Potential power is stored energy, and also kinetic energy is energy of motion. We will certainly investigate the carry of potential power (PE) come kinetic energy (KE) v the usage of a firecracker and also soda cans. The firecracker has chemical potential energy that is released when it is ignited. This power is adjusted to kinetic power after the firecracker explodes, leading to the cans to move. This process is similar to what happens as soon as your automobile moves. The gas (PE) explodes in the cylinder (KE) throwing the piston down. This mechanical energy is ultimately translated to activity of the wheels.Calculations:Gravitational Potential Energy= fixed of things (kg) x gravity (9.8m/s2) x elevation (m)Unit conversions: 1 joule = 1 Nm = 1 kg m2/s2Kinetic power = 1/2 x massive of things (kg) x velocity 2 (m/s)2Hypothesize: If the have the right to were initially placed above the ground, what direction(s) would certainly we view the can be ~ traveling? Materials and Suppliesbalancematches2 empty soda cansa small firecrackermeter stickGeneral safety and security GuidelinesWhen working v matches, be certain that you execute not have actually bulky garments which could catch on fire.Be sure that the area roughly the demonstration setup is clear, therefore that when you light the firecracker you have actually plenty of an are to move away from it.Stay far sufficient away from the setup once you have actually ignited the firecracker (3 m).
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ProcedureSet up your products to look like the photo below.The elevation of the table need to be one to two meters over the ground, making certain that that is level. Be sure to have actually at least 10 m radius clear about your table.Mass the two similar empty soda cans. Massive _____g after ~ placing the cans end to finish on the table, measure up the distance from the bottom of the deserve to to the floor. ________mAim the can be ~ such that they will not struggle anyone or anything throughout their flight.Carefully fit an unlit small firecracker between the 2 cans.Mark the edge of the can towards the firecracker top top the table through a pencil. Ignite the firecracker, and STEP earlier FROM SETUP AT the very least 3 M.Measure the horizontal distance each deserve to traveled indigenous spot ~ above the floor just below the initial mark. __________ m ; __________ m include the two distances and divide by two. The average distance is __________ m .
Video ClipSet up:Calculations: (show your work)Falling and also flying time of can Dv = 1/2gt2Horizontal velocity of have the right to Dh = V tKinetic power of each can: KE = 1/2mv2Gravitational potential power of every can: PE = mgDvQuestions:Compare the PE and also KE, room they equal? must PE and KE be equal? assistance your answer because that # 2 with facts native this experiment.List the pathway the energy transformed into, indigenous the firecracker being lit to the cans resting on the floor.For additional Thought and also Discussion:What execute you think the sound of the firecracker exploding and also the deserve to hitting the floor can have to carry out with the exit energy? What do you think the light or sparks native the fuse might have to perform with energy? If there to be no sparks, would the net energy released be greater or the same? In regards to molecular motion, where does several of the energy go as soon as you shoot off a firecracker or bottle rocket?AnswersNo.No view answer to #3.The kinetic energy of calculation 3 is indigenous the firecracker. The potential energy of calculation 4 is from gravity and also the elevation of the cans which has actually nothing to do with the firecracker.The match allows the chemical energy of the wick to transfer into light, sound, and also heat energy. This warmth energy collection off the chemistry reaction the the explosive i beg your pardon is converted to different forms of energy. This power goes into light, sound, heat, and also kinetic energy. This kinetic power is absorbed by the can be ~ which have also absorbed some of the warm of the explosion. Together the cans move off that the support, their potential energy is converted into kinetic energy in the vertical direction. The cans proceed to obtain kinetic power in the vertical direction till the can be ~ hit the ground. In ~ this point, the kinetic energy of the can be ~ is converted into heat and also noise of i m sorry the ground and also air absorb.For additional thought and discussion:Sound is the move of energy in waves at audible frequencies. Few of the initial energy in the spark of the firecracker was lost to sound as the deserve to hit the floor.Light is comparable to sound in the it travels as both a wave and also a particle. It takes energy to create light waves. Some of the chemical power went right into making the irradiate in the spark.When you shoot turn off a party rocket, the same principles of the experiment apply. The energy derived from the match is provided to to explode the firecracker.
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The then heats the molecules and also creates an to explode forcing the bottle rocket increase in the air. The remaining energy heats the molecule in and around the bottle itself, pushing it backwards.