2. The Man’s Jeopardy

3. Learning Objectives 1.Identify when work is done on an object. 2.Explain how machines make work easier (2 ways). 3.Determine the mechanical advantage of a machine (relative to 1). 4.Describe the 6 types of simple machines including the different pulley setups and different classes of levers. 5.Describe the mechanical advantage (relative to 1) for each simple machine in terms of output vs. input force.

4. RULES 1.All questions will be all-play even the daily doubles. 2.The teams who answers correctly win the point value of the question. 3.If a team answers a daily double incorrectly, then that team will lose the number of points they bid. 4.There is 1 daily double available. Let’s play

5. 100 200 300 400 Final Jeopardy 100 200 300 400 500 Work & Eff. Machines & Forces Types of Machines

6. Work & Efficiency for 100 Which of the following is NOT an example of work being done on an object: holding a button down on your Xbox controller, keeping a giant boulder held above your head, and/or pushing a heavy load up a ramp? Holding the button down & holding a giant boulder are NOT examples of doing work.

7. Work & Efficiency for 200 Real machines operate at (greater than, less than, or equal to) 100% efficiency. Explain your answer. Less than 100% efficiency Friction causes the efficiency to be less than 100%.

8. Work & Efficiency for 300 What are 2 ways that machines make work easier? Lowering the applied force or Changing the direction of the force

9. Work & Efficiency for 400 What is a compound machine? A machine that uses 2 or more simple machines.

10. Machines & Forces for 100 If the output force is greater than the input force, then the M.A. is (greater than, less than, or equal to) 1. M.A. is GREATER than 1

11. Machines & Forces for 200 A coat zipper makes work easier by _________ the applied force. lowering

12. Machines & Forces for 300 For a wheel and axle type of machine, how does the input force compare to the output force? How does the input distance compare to the output distance? Drawing a diagram may help you answer this question. Input force is less than the output force. Input distance is greater than the output distance.

13. Machines & Forces for 400 For the lever shown below, describe how the input force compares to the output force. So, if the output force or load is 45 N, then what would be a possible input force? The input force is less than the output force. Input force should be less than 45 N.

14. Machines & Forces DAILY DOUBLE! Suppose for a pair of pliers, the input force is 15 N, so what would be a possible output force? Any value greater than 15 N is correct. (Between 20 N and 45 N would be ideal)

15. Types of Machines for 100 Two examples of inclined planes would be ________ and ________. The one that is an inclined plane circling about an axis is the __________. Ramps and screws Screw = inclined plane wrapped around an axis

16. Types of Machines for 200 Simple Machines & the Human Body: Your teeth act as _______ to bite into food, and when you rotate your forearm it acts as a ________ & __________. Teeth = Wedges Rotating your forearm = Wheel & Axle

17. Types of Machines for 300 What type of simple machine is shown in the drawing below? Lever (1 st class)

18. Types of Machines for 400 A screwdriver is an example of which type of simple machine because the handle acts as the ________ and the rigid metal rod is the _______. If the output force of the screwdriver is 75 N, then the input force has to be (greater than, less than, or equal to) 75 N. Wheel & Axle Wheel (handle), Axle (rigid metal rod) Input force is LESS THAN 75 N.

19. Levers Which lever below will lower the applied force and change the direction of the force (the one on the left, in the middle, or on the right)? The one on the left (1 st class lever)