Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. An object that has kinetic energy must be _____. Falling. At an elevated position. At rest. Moving. 2. Collision between two carom coins is an example for ____ Inelastic collision Perfectly inelastic collision Elastic collision Oblique collision 3. If an object has kinetic energy, then it also must have ____ Force Speed Impulse Acceleration 4. How many Joules of energy are in one kilowatt-hour? 1 J 60 kilojoules 3.6 megajoules 60 J 5. A feather and a coin dropped in a vacuum fall with equal _____. Kinetic energies Accelerations Forces Momenta 6. Two identical arrows, one with twice the speed 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. Four times as far as the slower arrow. The same distance as the slower arrow. 7. A machine does 2500 J of work in 1 min. What is the power developed by the machine? 150 W 21 W 2500 W 42 W 8. If you have to push a car forward, what are the forces acting on you? Your own muscles push you down. No forces act on you. The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you. Only gravity. 9. 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. 10. 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 11. When a body falls freely under gravity, then the work done by the gravity is ________ Infinity Zero Negative Positive 12. 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 twice to that of the initial Becomes four times to that of the initial Remains the same Becomes 16 times to that of the initial 13. A moving hammer drives a nail into the wood. It has kinetic energy. True False 14. The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be: 0.25 5 25 2.5 15. 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 µmg mg µmgv 16. When a light body collides with a massive body at rest _____ No reaction happens The light body rebounds after the collision The massive body rebounds after the collision The light body Remains at rest 17. If a mass is at rest, what must be applied to cause it to move? Force Kilograms Vectors Speed 18. 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 _____. Less than 100 J. Not enough information given. More than 100 J. 100 J. 19. When a massive body collides against a light body at rest ____ The velocity of the bodies get exchanged The massive body comes to rest The light body starts moving The light body rebounds 20. 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. Less. The same Four times as much 21. An object that has potential energy has this energy because of its ____ Speed. Acceleration. Location Momentum. 22. 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 cannot be forced. You are pulled towards the wall. The wall moves back 3 cm. 23. A bullet fired from a gun can pierce a target due to its ___________ Heat energy Kinetic energy Mechanical energy Acceleration 24. The type of energy possessed by a simple pendulum, when it is at the mean position is: Potential energy Sound energy Kinetic energy Kinetic + Potential energy 25. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 107 kW? 9g 2g 10g 9.6g 1 out of 25 Time is Up! Time's up