28/03/2020 Energy, Work and Power(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Collision between two carom coins is an example for ____ Oblique collision Inelastic collision Perfectly inelastic collision Elastic collision 2. As an object goes up a hill at constant velocity, which of the following is NOT true? The object's Potential Energy is increasing. The object's speed is constant. The object's Kinetic Energy is decreasing. The object's Kinetic Energy is constant. 3. For a body moving in a circular path, the work done by the centripetal force is ________ Constant Negative Zero Positive 4. A moving hammer drives a nail into the wood. It has kinetic energy. True False 5. When a light body collides with a massive body at rest _____ The light body rebounds after the collision No reaction happens The light body Remains at rest The massive body rebounds after the collision 6. If a mass is at rest, what must be applied to cause it to move? Vectors Kilograms Speed Force 7. An object that has potential energy has this energy because of its ____ Momentum. Acceleration. Location Speed. 8. Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate _____. More than four times as far as the slower arrow. The same distance as the slower arrow. Four times as far as the slower arrow. Twice as far as the slower arrow. 9. What happens to the total energy of a moving object if all the applied forces are conserved? It increases It remains constant It decreases The velocity is required to answer this question 10. When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive. True False 11. A person jumps to the ground from a platform 10 feet high. Which of the following is true? The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land. The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land. The person has more kinetic energy before they jump than after they jump. The person has less potential energy at the top of the platform than in the air. 12. How many Joules of energy are in one kilowatt-hour? 1 J 3.6 megajoules 60 J 60 kilojoules 13. If a force acts perpendicular to the direction of motion of a body, what is the amount of work done? Infinity Sinθ Zero Constant 14. For a collision to occur, the actual physical contact is necessary. False True 15. Two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale. The faster arrow will penetrate _____. Four times as far as the slower arrow. More than four times as far as the slower arrow. The same distance as the slower arrow. Twice as far as the slower arrow. 16. An object that has kinetic energy must be _____. Falling. At rest. Moving. At an elevated position. 17. Which of the following is NOT a consequence of "The Law of Conservation of Energy"? The energy in a closed system is always constant Potential Energy can never be greater than Kinetic 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 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 18. 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? H-2gm The square root of 2gh Two times ghm squared One-half the mass squared 19. Which of the following is not a unit for power? Newton-meter per second Joule – second Watt Horsepower 20. A block with a mass of m crosses a rough horizontal surface at a constant speed of v. The coefficient of kinetic friction between the block and the surface isµ. How much power must be produced in order to overcome the friction force? µmg mg µg µmgv 21. The potential energy of an object is equal to ________ The force of gravity working on the object. The velocity of the object divided by its mass. The size of the object compared to its surface area. The work done on the object to put the object into its current state. 22. Which of the following is an example of inelastic collision? Collision between two railway compartments Collision between two vehicles A bullet fired into a wooden block Collision between glass balls 23. If you push on a wall with a force of 30 N, then ______________. The wall pushes on you with a force of 30 N. The wall moves back 3 cm. You are pulled towards the wall. The wall cannot be forced. 24. A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is _____. More than 100 J. 100 J. Not enough information given. Less than 100 J. 25. When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______. Less. Four times as much Twice as much. The same 1 out of 25 Time is Up! Time's up
