Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. 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 2. Which of the following is an example of inelastic collision? Collision between two vehicles Collision between glass balls Collision between two railway compartments A bullet fired into a wooden block 3. What happens to the total energy of a moving object if all the applied forces are conserved? It decreases It remains constant The velocity is required to answer this question It increases 4. 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 30 N 3000 N 5. For a body moving in a circular path, the work done by the centripetal force is ________ Constant Zero Positive Negative 6. 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 twice to that of the initial Becomes 16 times to that of the initial Remains the same 7. "Power" is defined as ________ The sum of potential and kinetic energy The energy necessary to do work The rate at which work is done The velocity of an object squared 8. A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the work done by him. (g=9.8m/s^{2}) 2514J 250J 400J 1960J 9. 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 10. An object that has kinetic energy must be _____. Falling. Moving. At an elevated position. At rest. 11. A machine does 2500 J of work in 1 min. What is the power developed by the machine? 42 W 150 W 2500 W 21 W 12. Mud thrown on a wall and sticking to it is an example for _____ Perfectly inelastic collision Inelastic collision Elastic collision Super elastic collision 13. Collision between two carom coins is an example for ____ Oblique collision Inelastic collision Elastic collision Perfectly inelastic collision 14. The kinetic energy of an object will increase the most if you _______________ Double the potential energy Double the mass of the object Double the velocity of the object Double the temperature of the object 15. Which of the following is NOT a consequence of "The Law of Conservation of Energy"? Potential Energy can never be greater than Kinetic 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. 16. If a force acts perpendicular to the direction of motion of a body, what is the amount of work done? Zero Constant Sinθ Infinity 17. If you push on a wall with a force of 30 N, then ______________. The wall cannot be forced. You are pulled towards the wall. The wall moves back 3 cm. The wall pushes on you with a force of 30 N. 18. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s^{2}): 5 J 5000 J 500 J 50 J 19. A bullet fired from a gun can pierce a target due to its ___________ Acceleration Kinetic energy Heat energy Mechanical energy 20. If a mass is at rest, what must be applied to cause it to move? Speed Vectors Force Kilograms 21. 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. 100 J. More than 100 J. 22. 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 100J 200J 50J 23. How many Joules of energy are in one kilowatt-hour? 1 J 60 kilojoules 60 J 3.6 megajoules 24. A moving hammer drives a nail into the wood. It has kinetic energy. False True 25. The potential energy of an object is equal to ________ The velocity of the object divided by its mass. The size of the object compared to its surface area. The force of gravity working on the object. The work done on the object to put the object into its current state. 1 out of 25 Time is Up! Time's up