2. Chapter 8 Work and Machines

3. 100 200 400 300 400 Work Simple Machines Power Simple Machines 300 200 400 200 100 500 100

4. Row 1, Col 1 What is the work that you do on a machine called? Work Input

5. 1,2 What is the fixed point on a lever? Fulcrum

6. 1,3 What is the rate at which work is done or energy is transformed? Power

7. 1,4 What is a simple machine that uses a bar that pivots on a fixed point? Lever

8. 2,1 What is the work done by a machine on an object called? Work Output

9. 2,2 What is a simple machine consisting of two circular objects of different sizes? How does this machine make work easier? Wheel and Axle- it increases force by allowing you to apply less force over a greater distance.

10. 2,3 What is the Si unit used to express power? Watt

11. 2,4 What are the three parts of a lever? Fulcrum, Input Force, and Output Force (Load)

12. 3,1 What is the SI unit for work? Joule

13. 3,2 What is a simple machine with a grooved wheel that holds a cable? Pulley

14. 3,3 What is the formula used to calculate power? Work divided by Time

15. 3,4 What is a simple machine that consists of two inclined planes that moves? What is the advantage of this machine? Wedge – it increases force by allowing you to apply less force over a greater distance.

16. 4,1 What is the comparison of a machine’s work output with work input? Mechanical Efficiency

17. 4,2 A bottle top is an example of which simple machine? Screw

18. 4,3 What prevents machines from being 100% efficient? Friction

19. 4,4 What is a straight slanted surface called? How does it make work easier? Inclined Plane – it increases force by allowing you to apply less force over a greater distance

20. 5,1 What is the transfer of energy using a force that causes an object to move in the direction of the force? Work

21. 5,2 A device that makes work easier by changing the size or direction of force is called what? Machine

22. 5,3 What is two or more simple machines combined called? Compound Machine

23. 5,4 What are the three types of pulleys? Fixed, Moveable, and Block and Tackle