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 ____ Inelastic collision Oblique collision Elastic collision Perfectly inelastic collision 2. Mud thrown on a wall and sticking to it is an example for _____ Super elastic collision Inelastic collision Elastic collision Perfectly inelastic collision 3. 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 12250W 1225W 122.5W 4. When a massive body collides against a light body at rest ____ The massive body comes to rest The velocity of the bodies get exchanged The light body rebounds The light body starts moving 5. A bullet fired from a gun can pierce a target due to its ___________ Kinetic energy Mechanical energy Acceleration Heat energy 6. A motorbike engine can develop a power of 90000 W in order to keep a constant velocity of 30 m/s. What is the pushing force? 300 N 30000 N 3000 N 30 N 7. If you have to push a car forward, what are the forces acting on you? Only gravity. 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. Your own muscles push you down. No forces act on you. 8. The kinetic energy of an object will increase the most if you _______________ Double the potential energy Double the mass of the object Double the temperature of the object Double the velocity of the object 9. 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? 6000 W 600 W 60 W 60000 W 10. When a body is lifted, the work done by the gravitational force is positive. True False 11. 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: 25 5 2.5 0.25 12. "Power" is defined as ________ The energy necessary to do work The sum of potential and kinetic energy The velocity of an object squared The rate at which work is done 13. 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 Remains the same Becomes 16 times to that of the initial Becomes twice to that of the initial 14. An object that has kinetic energy must be _____. Moving. At rest. Falling. At an elevated position. 15. A truck drives slams on the brakes of a moving truck with a constant velocity v, as a result of his action the truck stops after traveling a distance d. If thedriver had been traveling with twice the velocity, what would be the stopping distance compared to the distance in the first trial? One-quarter as much Two times greater Four times greater Half as much 16. 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 17. Which of the following is not a unit for power? Joule – second Newton-meter per second Watt Horsepower 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 _____. 100 J. Not enough information given. Less than 100 J. More than 100 J. 19. When a body slides against a rough horizontal surface, the work done by friction is _____ Zero Constant Positive Negative 20. When a light body collides with a massive body at rest _____ No reaction happens The light body Remains at rest The massive body rebounds after the collision The light body rebounds after the collision 21. 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 22. As an object goes up a hill at constant velocity, which of the following is NOT true? The object's speed is constant. The object's Kinetic Energy is constant. The object's Kinetic Energy is decreasing. The object's Potential Energy is increasing. 23. How many Joules of energy are in one kilowatt-hour? 60 kilojoules 1 J 3.6 megajoules 60 J 24. 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 25. 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? 50J 150J 100J 200J 1 out of 25 Time is Up! Time's up