Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. 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):500 J5000 J50 J5 J2. An object that has potential energy has this energy because of its ____Momentum.Speed.LocationAcceleration.3. 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?Two times ghm squaredThe square root of 2ghH-2gmOne-half the mass squared4. "Power" is defined as ________The energy necessary to do workThe sum of potential and kinetic energyThe velocity of an object squaredThe rate at which work is done5. 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 N3000 N30 N30000 N6. Which of the following is an example of inelastic collision?Collision between two vehiclesA bullet fired into a wooden blockCollision between glass ballsCollision between two railway compartments7. If an object has kinetic energy, then it also must have ____ForceAccelerationImpulseSpeed8. If you have to push a car forward, what are the forces acting on you? Your own muscles push you down.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.No forces act on you.9. When a body is lifted, the work done by the gravitational force is positive.TrueFalse10. 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/s2)400J250J2514J1960J11. If you push on a wall with a force of 30 N, then ______________. The wall moves back 3 cm.You are pulled towards the wall.The wall cannot be forced.The wall pushes on you with a force of 30 N.12. 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.122.5W1225W122W12250W13. When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive.FalseTrue14. 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 initialRemains the sameBecomes twice to that of the initialBecomes 16 times to that of the initial15. Which one of the following is not the unit of energy?JouleKilowattKilowatt hourNewton meter16. 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 muchHalf as muchTwo times greaterFour times greater17. What happens to the total energy of a moving object if all the applied forces are conserved?The velocity is required to answer this questionIt decreasesIt increasesIt remains constant18. The type of energy possessed by a simple pendulum, when it is at the mean position is:Kinetic + Potential energyKinetic energyPotential energySound energy19. How many Joules of energy are in one kilowatt-hour? 60 kilojoules60 J3.6 megajoules1 J20. The kinetic energy of an object will increase the most if you _______________Double the temperature of the objectDouble the potential energyDouble the mass of the objectDouble the velocity of the object21. The potential energy of an object is equal to ________The size of the object compared to its surface area.The velocity of the object divided by its mass.The force of gravity working on the object.The work done on the object to put the object into its current state.22. Mud thrown on a wall and sticking to it is an example for _____Elastic collisionInelastic collisionPerfectly inelastic collisionSuper elastic collision23. For a body moving in a circular path, the work done by the centripetal force is ________ConstantZeroPositiveNegative24. 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.25. For a collision to occur, the actual physical contact is necessary.TrueFalse26 out of 25Time is Up!
