Chapter 9 Review - Work and Machines

Master work and machines! Review simple machines, mechanical advantage, levers, pulleys, and more.

Use notes and pages 308 - 334 in your textbook to answer the following fill in the blank questions. 1. Work is done on an object when the object moves in the same direction in which the force is exerted.2. Work equal Force times distance.3. One joule is the amount of work done when you exert one newton of force to move an object one meter.4. One joule per second equals one watt.5. Machine is a device that allows you to do work in an easier way6. A machine does not reduce the amount of work. They change the way you do the work.7. Mechanical Advantage is the number of times a machine increases a force exerted on it8. Ideal mechanical advantage is without friction.9. All machines waste some work to overcome the force of friction.10. Inclined plane is a flat sloped surface11. An Inclined plane allows you to exert your input force over a greater distance12. Ideal MA of an inclined plane equals length divided by the height.13. Wedge is a device that is thick on one end and taper to thin edge on the other end. It is two inclined planes back to back.14. Ideal MA of a wedge is equal to the length divided by the width15. A long thin wedge would have greater MA16. A screw can be thought of as an inclined plane wrapped around a cylinder.17. The mechanical advantage of a screw is greater if the threads are close together.18. Lever is a rigid bar that is free to rotate on a fixed point. The fixed point is the fulcrum.19. The mechanical advantage of a lever is equal to the distance from the fulcrum to the input force(effort) divided by the distance from the fulcrum to the output force (resistance).20. The class of lever is determined by where the fulcrum is in relation to the input force and the output force.21. A pulley is a simple machine made of a grooved wheel with a rope or cable wrapped around it.22. The ideal mechanical advantage of a pulley is equal to the number of rope sections that support the object.23. A block and tackle a pulley system made of a combination of fixed and movable pulleys.24. A wheel and axle is a simple machine with two connected object that turn on a common axis25. The ideal mechanical advantage of a wheel and axle is equal to the radius of the wheel divide by the radius of the axle.26. A compound machines combines two or more simple machines into a single machine.27. The mechanical advantage of a compound machines is found by multiplying together the ideal Mechanical Advantages of the simple machines it is made of.