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Physica Science Test: Machines Short Answer Label the following diagram by choosing the letter of the term that correctly identifies each part. a. fulcrum b. output arm c. input arm d. resistance force e. effort force 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ Matching Match each term with one of the descriptions below. A. compound machine D. mechanical advantage B. efficiency E. simple machine C. effort force 6. 7. 8. 9. 10. work output of a machine divided by the work input ratio of resistance force to effort force device that does work with only one movement the force you apply to a simple machine device made up of more than one simple machine Multiple Choice 11. Bob uses a pulley system to raise a 297 N crate 33.5 m. A force of 105 N is exerted and the rope is pulled 94.76 m. What is its mechanical advantage? A. 8.87 B. 0.35 C. 2.83 D. 3.13 E. 1.11 12. A slanted surface used to raise an object is a(n) ____. A. inclined plane C. screw B. effort ramp D. efficiency board 13. A device that does work with only one movement and changes the size or direction of a force is a(n) ____. A. effort machine C. compound machine B. simple machine D. screw 14. A bar that is free to pivot about a fixed point is a ____. A. screw B. ramp C. fulcrum D. lever 15. The amount by which a machine multiplies an effort force is called the ____. A. efficiency factor C. fulcrum B. resistance force D. mechanical advantage 16. Select the correct list of simple machines. A. lever, pulley, wheel and axle, inclined plane, wedge, screw, gas motor, electric motor B. lever, pulley, wheel and axle, inclined plane, wedge, screw, gas motor C. lever, pulley, wheel and axle, vertical plane, wedge, screw, gas motor, electric motor D. lever, pulley, wheel and axle, horizontal plane, wedge, screw, gas motor, electric motor E. lever, pulley, wheel and axle, inclined plane, wedge, screw 17. An inclined plane with one or two sloping sides forms a machine called a ____. A. lever B. pulley C. wedge D. ramp 18. An inclined plane wrapped around a cylindrical post is a ____. A. lever C. screw B. ramp D. block and tackle 19. When two or more simple machines work together, they are called a(n)____. A. effort machine C. screw B. compound machine D. simple machine 20. Two simple machines that are part of a bicycle are a(n)____. A. inclined plane and a wedge C. gear and a wheel and axle B. screw and an inclined plane D. inclined plane and a lever 21. An inventor claims to have built a machine that can produce 120 J of work with an input of 110 J. Would you believe the inventor's claim? A. Not enough information C. Yes B. No 22. Calculate the mechanical advantage for the machine shown. A. 15 B. 0.067 C. 8.4 D. 5.4 Figure 5-2 23. Find the mechanical advantage of the second-class lever shown in Figure 5-2. A. 1 B. 3 C. 0.25 D. 4 24. Calculate the ideal mechanical advantage of a lever that is 6 m long and that has 4.5 m effort arm. A. 1.33 B. 0.33 C. 0.75 D. 3 25. What is required for work to be done? A. there must be energy released C. you must be paid B. there must be energy applied D. the object must move
