Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The potential energy of an object is equal to ________ The force of gravity working on the object. The work done on the object to put the object into its current state. The size of the object compared to its surface area. The velocity of the object divided by its mass. 2. 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? µg mg µmgv µmg 3. When a coolie walks on a horizontal platform with a load on his head, the work done by the coolie on the load is zero. False True 4. A person is holding a bucket by applying a force of 10N. He moves a horizontal distance of 5m and then climbs up a vertical distance of 10m. Find the total work done by him? 150J 50J 100J 200J 5. What happens to the total energy of a moving object if all the applied forces are conserved? It increases It decreases The velocity is required to answer this question It remains constant 6. A bullet fired from a gun can pierce a target due to its ___________ Kinetic energy Acceleration Mechanical energy Heat energy 7. A feather and a coin dropped in a vacuum fall with equal _____. Accelerations Kinetic energies Momenta Forces 8. When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive. False True 9. The kinetic energy of an object will increase the most if you _______________ Double the mass of the object Double the potential energy Double the temperature of the object Double the velocity of the object 10. If you push on a wall with a force of 30 N, then ______________. The wall cannot be forced. The wall pushes on you with a force of 30 N. The wall moves back 3 cm. You are pulled towards the wall. 11. A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car. Becomes four times to that of the initial Becomes 16 times to that of the initial Becomes twice to that of the initial Remains the same 12. Which of the following is NOT a consequence of "The Law of Conservation of Energy"? 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 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. Potential Energy can never be greater than Kinetic Energy 13. If a force acts perpendicular to the direction of motion of a body, what is the amount of work done? Zero Constant Infinity Sinθ 14. Collision between two carom coins is an example for ____ Oblique collision Inelastic collision Elastic collision Perfectly inelastic collision 15. 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 ______. Twice as much. Four times as much The same Less. 16. Which of the following is not a unit for power? Newton-meter per second Watt Joule – second Horsepower 17. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 10^{7} kW? 9g 9.6g 2g 10g 18. When a light body collides with a massive body at rest _____ No reaction happens The light body rebounds after the collision The light body Remains at rest The massive body rebounds after the collision 19. When a body falls freely under gravity, then the work done by the gravity is ________ Positive Negative Zero Infinity 20. A car travels with a constant speed of 15 m/s. The car’s engine produces a 4000 N pushing force in order to keep the speed constant. How much power isdeveloped by the engine? 60 W 6000 W 600 W 60000 W 21. Two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale. The faster arrow will penetrate _____. Twice as far as the slower arrow. 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. 22. A machine gun fires 60 bullets per minute, with a velocity of 700m/s. If each bullet has a mass of 50g, find the power developed by the gun. 122W 122.5W 1225W 12250W 23. 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 Two times ghm squared H-2gm One-half the mass squared 24. When a massive body collides against a light body at rest ____ The velocity of the bodies get exchanged The light body starts moving The massive body comes to rest The light body rebounds 25. Which of the following is an example of inelastic collision? A bullet fired into a wooden block Collision between two vehicles Collision between two railway compartments Collision between glass balls 1 out of 25 Time is Up! Time's up