Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. If a mass is at rest, what must be applied to cause it to move? Vectors Speed Force Kilograms 2. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s2): 5000 J 5 J 50 J 500 J 3. When a body is lifted, the work done by the gravitational force is positive. True False 4. A machine does 2500 J of work in 1 min. What is the power developed by the machine? 150 W 42 W 21 W 2500 W 5. 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. 6. The kinetic energy of an object will increase the most if you _______________ Double the potential energy Double the velocity of the object Double the temperature of the object Double the mass of the object 7. 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. The same Less. Four times as much 8. If an object has kinetic energy, then it also must have ____ Speed Force Impulse Acceleration 9. A person jumps to the ground from a platform 10 feet high. Which of the following is true? The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land. The person has less potential energy at the top of the platform than in the air. The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land. The person has more kinetic energy before they jump than after they jump. 10. 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. 11. A bullet fired from a gun can pierce a target due to its ___________ Heat energy Acceleration Mechanical energy Kinetic energy 12. A feather and a coin dropped in a vacuum fall with equal _____. Accelerations Kinetic energies Forces Momenta 13. Mud thrown on a wall and sticking to it is an example for _____ Super elastic collision Elastic collision Perfectly inelastic collision Inelastic collision 14. 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? 200J 100J 50J 150J 15. 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 600 W 60000 W 6000 W 16. An object that has potential energy has this energy because of its ____ Momentum. Location Acceleration. Speed. 17. 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? µmgv µmg µg mg 18. As an object goes up a hill at constant velocity, which of the following is NOT true? The object's Kinetic Energy is constant. The object's speed is constant. The object's Potential Energy is increasing. The object's Kinetic Energy is decreasing. 19. 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. Remains the same Becomes 16 times to that of the initial Becomes twice to that of the initial Becomes four times to that of the initial 20. When a light body collides with a massive body at rest _____ No reaction happens The massive body rebounds after the collision The light body Remains at rest The light body rebounds after the collision 21. If a force acts perpendicular to the direction of motion of a body, what is the amount of work done? Constant Infinity Zero Sinθ 22. 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. True False 23. A moving hammer drives a nail into the wood. It has kinetic energy. True False 24. When a body slides against a rough horizontal surface, the work done by friction is _____ Zero Constant Positive Negative 25. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 107 kW? 9.6g 9g 2g 10g 1 out of 25 Time is Up! Time's up
