Welcome to your Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. [ Junior school science (physics) ]A person jumps to the ground from a platform 10 feet high. Which of the following is true? The person has more kinetic energy before they jump than after they jump. The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land. The person has less potential energy at the top of the platform than in the air. The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.2. [ Junior school science (physics) ]Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h. The kinetic energy of car A is _____. Four times that of car B Twice that of car B Equal that of car B Half that of car B3. [ Junior school science (physics) ]A bullet of mass 40g is moving with a speed of 2.16km/h. Calculate its kinetic energy 0.0072J 72J 7.2J 0.072J4. [ Junior school science (physics) ]Which of the following is not a unit for power? Watt Joule – second Newton-meter per second Horsepower5. [ Junior school science (physics) ]Which of the following is NOT a consequence of "The Law of Conservation of Energy"? It is not necessary to use Kinematics to discover the velocity of an object accelerated by gravity if you know it's initial Potential Energy and its mass. The energy in a closed system is always constant The Kinetic Energy of a dropped object at the instant it hits the ground is roughly equal to the potential energy of the object at the instant it was dropped Potential Energy can never be greater than Kinetic Energy6. [ Junior school science (physics) ]A feather and a coin are dropped in the air. Each falls with equal _____. Momenta Potential energy None of the above Kinetic energies7. [ Junior school science (physics) ]An object with mass "m" kilograms is suspended "h" meters above the ground by a string. If the string is cut, what will the velocity of the object be at the instant it hits the ground? The square root of 2gh One-half the mass squared H-2gm Two times ghm squared8. [ Junior school science (physics) ]Kinetic energy is energy of a body due to its motion length distance position9. [ Junior school science (physics) ]"Power" is defined as ________ The rate at which work is done The energy necessary to do work The sum of potential and kinetic energy The velocity of an object squared10. [ Junior school science (physics) ]An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high it gains _____. Four times as much potential energy. Neither of these. Half as much potential energy Twice as much potential energy.11. [ Junior school science (physics) ]Electric current in a/an ____________________ circuit travels in MORE THAN ONE path. Connected Wire Series Parallel12. [ Junior school science (physics) ]The kinetic energy of an object will increase the most if you _______ Double the mass of the object Double the velocity of the object Double the potential energy Double the temperature of the object13. [ Junior school science (physics) ]Strictly speaking, a car will burn more gasoline if the car radio is turned on. This statement is ____ Totally false. True only if the car's engine is running. True only if the car's engine is stopped. Always true.14. [ Junior school science (physics) ]The potential energy of an object is equal to _______ The force of gravity working on the object. The size of the object compared to its surface area. The work done on the object to put the object into its current state. The velocity of the object divided by its mass.15. [ Junior school science (physics) ]How many Joules of energy are in one kilowatt-hour? 3.6 megajoules 60 kilojoules 1 J 60 J16. [ Junior school science (physics) ]Electric current in a/an _____________________ circuit travels in ONE path Parallel Electric Series Wire17. [ Junior school science (physics) ]If a mass is at rest, what must be applied to cause it to move? Vectors Speed Kilograms Force18. [ Junior school science (physics) ]Which of the following is NOT a good insulator? Iron All of the above Glass Plastic19. [ Junior school science (physics) ]Which of the following is needed by plants for production of food? Wind Sun Water Air20. [ Junior school science (physics) ]If an object has kinetic energy, then it also must have _____. Speed Acceleration Force Impulse21 out of 20Time is Up!
