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Chapter 14 - Work and Power – Physical Science Study Guide 1. What is the difference in work and power? 2. A force acting on an object does no work if _________________________________. 3. What is the unit of work? 4. Know how to solve a work problem 5. What is the SI unit for power? 6. The power of machines measures ________________________________________. 7. Know how to solve a power problem 8. What do you do to increase power? 9. A machine is a device that can multiply __________. 10. When a machine does work it can not increase a force and _______________________. 11. How can a machine make work easier for you? 12. How can you make the work output of a machine greater than the work input? 13. The actual mechanical advantage of a machine is less than the _______________ of the machine. 14. If you know the input distance and output distance of a machine, what can you calculate? 15. Know how to solve IMA problem 16. Reducing friction in a machine increases its efficiency. 17. An incline plane reduces effort force by _____________________________. 18. An ax is an example of a ________________. 19. What is an example of a wheel and axle? 20. The ideal mechanical advantage of a pulley system is equal to _______________________. 21. The IMA of a wheel and axle is found by________________________________. 22. What is an example of a compound machine? 23. A machine is classified as a compound machine if it _________________________________.