Physics Quiz 2nd Quarter PDF

**Quiz \#2 in Physics** **1. Work is defined as** A. Force per unit time B. Force over a distance C. Force per unit distance D. None of the above **2. What are the units of work?** A. Newtons B. Watts C. Joules D. None of the above **3. A force of 10 N works on a ball over a distan...

**Quiz \#2 in Physics** **1. Work is defined as** A. Force per unit time B. Force over a distance C. Force per unit distance D. None of the above **2. What are the units of work?** A. Newtons B. Watts C. Joules D. None of the above **3. A force of 10 N works on a ball over a distance of 5 m. The force is parallel to the displacement of the ball. What is the total work done by the force?** A. -50 N B. 0 N C. 2 N D. 50 N **4. A force of 10 N works on a ball over a distance of 5 m. The force is perpendicular to the displacement of the ball. What is the total work done by the force?** A. -50 N B. 0 N C. 2 N D. 50 N **5. The work done by a given force over a given distance is proportional to** A. The velocity of the particle B. The sine of the angle between the force and the displacement C. The cosine of the angel between the force and the displacement D. The time during which the force acts **6. A force of 1 N, parallel to the displacement of the object, acts on an object over a distance of 1 m. How much work is done?** A. 1 Joule B. 1 Watt C. 2 Joules D. 2 Watts **7. A constant force of 10 N causes a box to move at a constant speed of 2 m/s. How much work is done in 10 seconds?** A. 200 J B. 50 J C. 10 J D. 2 J **8. A mass is kept stationary by an external force. All of the following are true EXCEPT:** A. The point of application of the force does not move B. No work is done on the mass C. There is no net force on the mass D. The external force may perform work on the mass **9. Energy is measured in the same units as** A. Power B. Force C. Work D. None of the above **10. Kinetic energy is proportional to** A. *v*^2^ B. v C. a D. Work **11. A force of 2 N acts parallel to the displacement of a particle for a distance of 10 m. What is the kinetic energy of the particle?** A. 5 J B. 20 J C. 12 J D. Not enough information **12. Kinetic energy is** A. A scalar B. Dimensionless C. A vector D. None of the above **13. Power is defined as** A. Work per unit length B. Force per unit length C. Work times time D. Work per unit time **14. In a period of 10 seconds, an elevator lifts a weight of 1000 N a distance of 10 m at constant velocity. What is the average power of the elevator over this time?** A. 10000 W B. 100 W C. 1000 W D. 0 W **15. At a given point, a force of 20 N acts on a particle with velocity of 5 m/s what is the power exerted by the force?** A. 4 W B. 100 W C. 20 W D. 5 W **16. Potential energy is defined for** A. Nonconservative forces B. Conservative forces C. Constant velocity D. A force that always does zero net work **17. The potential energy is always the same for an object with the same** A. Velocity B. Speed C. Acceleration D. Position **18. Potential energy is defined as** A. Energy of motion B. Energy of configuration C. Total mechanical energy D. Energy of acceleration **19.A lady does 250J of work in 25seconds. What is her power output?** A. 10 W B. 10 J/s C. 10 N.m/s D. All are correct **20. A dog is (unsuccessfully) chasing a cat and transfers 300joules of energy in 20seconds. What is the power output of the dog?** A. 600 W B. 320 W C. 15 W D. 25 W