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Physics Homework Chapter 5 Complete Accurate Name ____ANSWERS_________________ Date _________________________________ On Time Follow instructions Write the BEST, correct answer in the blank provided. 1. The product of the component of a force acting the direction of displacement and the magnitude of the displacement is ….. 2. The ….. of an object is due to the object’s motion. 3. The …… states that the net work done by all the forces acting on an object is equal to the change in the object’s kinetic energy. 4. The ….. is associated with an object because of the position, shape, or condition of the object. 5. The ….. is stored in the gravitational fields of interacting bodies. 6. The ….. is available for use when a deformed elastic object returns to its original configuration. 7. A ….. is a parameter that is a measure of a spring’s resistance to being compressed or stretched. 8. …... is defined as the sum of kinetic energy and all forms of potential energy. 9. A quantity that measures the rate at which work is done or energy is transformed is called ….. 10. The unit of work in the international system is the ..... 11. The unit of power in the international system equal to one joule per second is the ….. 12. The direction of work is unimportant; thus work is a ….. quantity. 13. The sign of work is important: work done by an object is ….., work done on an object is ….. 14. For linear motion, kinetic energy is equal to half the product of the ..... and the square of the linear ..... 15. The force required to stretch a spring is directly proportional to the ..... 16. For a stretched spring, potential energy is equal to half the product of the….. and the square of the ..... through which the spring was stretched. 17. In doing work to raise the hammer of a pile driver, ….. must be exerted over a given distance. 18. As the hammer is raised, its potential energy ….. thus work is done on the hammer. 19. In its raised position, the hammer has greater ….. energy than ….. energy. 20. As the hammer is dropped, its potential energy is converted to …..energy. 21. The potential energy of the raised hammer allows it to do ….. to drive a pile into the ground. 22. Forces that conserve mechanical energy are called….. forces. 23. The force of friction is an example of a ..... force. 24. Measurements of potential energy depend on the definition of an arbitrary ….. level. 1. ___work___________ 2. ___kinetic energy____ 3. _work-kinetic energy theroem_ 4. _potential energy_____ 5. _gravitational potential energy_ 6. _elastic potential energy_ 7. _spring constant______ 8. _mechanical energy___ 9. ___power__________ 10. ___Joule___________ 11. ____Watt__________ 12. ____scalar__________ 13. ___negative_________ ___positive_________ 14. ____mass__________ ___velocity_________ 15. __spring constant____ 16. __spring constant____ ___distance_________ 17. ___force___________ 18. ___increases________ 19. ___potential________ ___kinetic__________ 20. ___kinetic__________ 21. ____work__________ 22. __conservative______ 23. __dissipative_______ 24. ____zero__________ Place the letter(s) in the blank for all answers that make the statement correct. 25. Energy is (a) the capacity to do work. (b) acquired by an object raised to an elevated position. ( c) acquired by an object that is set in motion. (d) measured in work units. 26. In physics, work is done (a) in lifting an object from the floor to the table top. (b) in supporting an object on your shoulder. ( c) in reading your textbook. (d) in pushing an object across the floor. 27. The two factors that determine the amount of work done are (a) the magnitude of the force exerted and the weight of the object moved. (b) the distance the object is moved and the time required. ( c) the displacement of the object and the magnitude of the force in the direction of the displacement. (d) the magnitude of the force in the direction of the displacement and the time required. 28. The work done by a varying force (a) equals force times distance. (b) equals the area under a curve on a graph of magnitude of force acting in the direction of motion versus distance through which the force acts. ( c) may be approximated by the use of suitable rectangles. (d) may be determined by using calculus. 29. Kinetic energy is (a) due to the position of a mass. (b) due to the motion of a mass. ( c) due to the orientation of particles in a mass. (d) proportional to the mass of the object concerned. 30. Potential energy (a) is energy due to the position of a mass. (b) is energy due to the orientation of particles in a mass. ( c) is energy due to the motion of a mass. (d) of position is proportional to the mass of the object concerned. 31. A standard calorie (cal) (a) is defined as the amount of energy required to increase the temperature of 1 ml of water by 1C0. (b) equals 4.186 J. ( c) equals one food Calorie. (d) is required to be present in the diet of a healthy and active person. 32. The law of conservation of mechanical energy (a) is illustrated by a swinging pendulum. (b) states that the sum of the potential and kinetic energies of an energy system remains constant when no dissipative forces act on the system. ( c) involves frictional forces. ( d) involves systems where the work done is dependent on the path length. 33. In physics, power is (a) the capacity for doing work. (b) the time rate of doing work. ( c) the product of a displacement and the force in the direction of the displacement. (d) a unitless quantity. 25. ___a___b___c___d___ 26. ___a___________d___ 27. ____________c_____ 28. ______b___c___d___ 29. ______b_______d___ 30. __a___b___________ 31. __a___b_______d___ 32. __a___b___________ 33. _______b__________ 34. Use complete sentences to explain the block drop experiment. Include how that experiment is important to the study of Chapter 5. PROBLEMS: Show your work in completing the following. Write the answers with the correct number of significant digits. 35. A wagon weighing 225 N is pulled a distance of 25.0 m at constant speed in a straight line across a level floor. The wagon handle makes an angle of 30.00 with the floor. The force applied to the handle is 15.0 N. How much work is done? 36. A student weighing 750.0 N ran up the stairs from the first floor to the third floor in the elementary building. If this vertical distance is 8.00 m, how much work did the student do against gravity? 37. The physics teacher timed the student with a stop watch. If the student took 14.0 s to climb the two flights of stairs, how much power did the student exert? 35. __325J___________ 36. __6.00 x 103 J______ 37. _____429 W_______ 38. What power is required to raise 9500.0 N of coal from a mine 60.0 m 38. ___3170 W_______ below the ground in a time of 3.00 minutes? 39. What potential energy is acquired by a hammer, mass 750.0 g, when raised 35.0 cm off the ground? 39. ___257 J_________ 40. If the hammer in the previous problem is dropped, with what speed does it strike the ground? 40. ___2.62 m/s ______ 41. If a ball has a mass of 50.0 g and a velocity of 8.50 m/s east, what is its kinetic energy? 41. ___1.81 J_________ 42. If the ball from the previous problem hits a spring with an elastic constant of 375 N/m, how much does the spring compress? 42. ___98.1mm_______