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Observatory / f) e) d) What is the mass of a vehicle travelling at 90 travellingofvehicle isthe a at mass What Then, find ( Then, you the mass convert km/hmetres second:First, you 90 into m/s per 25 11129-B ______Guide energy increases gradually increases the energy as kinetic the not doeschange, energy mechanical since a the free-falling object, of case ______remainsenergymechanical conservationof energy, law to of the According ______following them equation: isexpressedin the between relationship becan intoenergy transformed potential energy. potential ______energy potential you If isalwaysintensityto field equal ______( mass ( potential energy gravitational energy, ( determinethe potential formula mathematical to gravitational used In 2  (25m/s) 718 J 750 2 newtons per newtonsper kilogram ANSWER KEY ANSWER E</p><p>Mechanical Mechanical energy ______300 kg 300 m m = E ) in )in 2 2E 2E constant constant v E 2 k k k k ______+ E Support activitiesSecond – Support Two of SecondaryYear Cycle = = = = = ______. p Kinetic energy can be transformed into transformed beinto can energy Kinetic double double m m m mv m 2 1 ), using the following formula: kilograms 2</p><p> where mv doubles doubles 2 isthe the and( (N/kg),height in a systemwithoutina E E p E E ______) is expressed )in isexpressed m p k is the mechanical energy in isthe energy mechanical is the kinetic energy kinetic in energy is the</p><p>______is the potential energy inenergy isthe potential </p><p>2 ______the mass or the height of an objectan the of mass height or the ______</p><p> potential energypotential (kg), gravitational field intensity ( intensitygravitational(kg), field km/h with a kinetic energy of 718energy kinetic of with km/h a 9.8 9.8 N/kg</p><p>Group: Group: kinetic energykinetic sum sum ______</p><p>______h ______) inmetres(m).The gravitational ) ______friction at the Earth’s surface.Earth’s at the joules ______Kinetic energy, Kinetic and energypotential decreases. potential energy</p><p> of of kinetic joules Date: joules .Themathematical , joules ______the gravitational the g</p><p>750 energy andenergy ) in ) E (J), the</p><p> p . 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Observatory / What is the speed of an SUV with a mass of SUV 5 anmass with a isthe speed of What birdwithmass theisaof air 1 high Howin potential energy ofenergy34 potential a hasthe hill, down ain his point run certain aat who, isthe skier kinetic of energy What energy? potential 154 mass with aof apple An h h h E 50 E E E E E find energy(EThen, potentialyou the gravitational convert g kilograms: First, you 154 into0.154 kg p 11129-B ______m m p p p Guide = = = mgh</p><p>E – 725 – J 34 = 2.26 J 0.154 kg = = = = E p k</p><p>+ E ANSWER KEY ANSWER = 4.08 4.08 m mgh mg 1 kg E E p p k</p><p>  300 J 40 J 40 9.8N/kg 9.8 N/kg 9.8N/kg Support activitiesSecond – Support Two of SecondaryYear Cycle </p><p>= 16 = 300  1.5 m</p><p> of energy50 J mechanical a and 425 J</p><p> g isplaced g 1.5 3</p><p> m above the ground. What isits gravitational ground. 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Name: mechanical energymechanical Observatory /</p><p> above the ground. above hem when andis 2.5 ground m above the haswhen he is 0.5 energy he acquired potential difference in the of Calculate his house. the outside is painting withmass kg aof man 85 A 11129-B Difference energy:Difference in potential – = J 2082.5 J 416.5 J 1666 2.5m ground: theAt from 0.5 mfrom At the ground: ______Guide ANSWER KEY ANSWER Support activitiesSecond – Support Two of SecondaryYear Cycle E E E E p p p p = = = = </p><p>E 2082.5 2082.5 J kg 85 416.5 416.5 J kg 85 p mgh=   </p><p>9.8 N/kg E 9.8 N/kg p 4 = mgh   2.5m 0.5m Group: Group: ______Kinetic energy, Kinetic and energypotential Date: ______ACTIVITY 11</p>