Simple Machines Test

1. Simple Machines Test

2. 1. Simple machines make work easier by • Increasing the load of an object. • Changing the amount of force needed. • Changing the direction of the force. • Both B and C.

3. 2. A simple machine with a bar that pivots at a fixed point is a(n) a. wedge b. lever c. screw d. pulley

4. 3. Which of the following simple machines has a grooved wheel that holds a rope? a. wedge b. pulley c. screw

5. 4. What is the advantage when the fulcrum is closer to the load in a first class lever? • an increase in distance the object can move. • There is less force needed to move the object. • There is no advantage.

6. 5. A wedge works by • pushing things apart. • keeping objects in place. • both a and b.

7. 6. Simple machines reduce the amount of work being done. a. true b. false

8. 7. Which simple machine is actually an inclined plane wrapped around a cylinder? a. wedge b. screw c. lever

9. 8. Which of the following pulleys does not decrease the amount of force needed to move an object? a. fixed b. movable c. compound

10. 9. Which of the following pulleys gives the greatest increase in the distance that you could move an object? a. fixed b. movable c. compound

11. 10. Which of the following pulleys gives you the greatest amount of increased force when moving an object? a. fixed b. movable c. compound

12. 11. Which inclined plane produces the most advantage when moving an object? a. example 1 b. example 2

13. 12. What advantage does an inclined plane provide when moving an object? • Allows you to use less force needed to move heavy objects. • Allows you to travel a farther distance when moving an object. • The inclined plane does not provide a mechanical advantage.

14. 13. You remember to place the lid back on the peanut butter jar, what simple machine did you use? a. screw b. wedge c. lever

15. 14. You need to block a door open, what simple machine would you use? a. wedge b. lever c. screw

16. 15. A hammer is an example of what simple machine? a. screw b. lever c. inclined plane

17. 16. A door knob is an example of what simple machine? a. wheel and axle b. lever c. wedge

18. 17. If you had to move a heavy rock with a board and a stone, which of the following simple machines would you use? a. lever b. inclined plane c. pulley

19. 18. Stairs are an example of which simple machine? a. lever b. inclined plane c. pulley

20. 19. A machine that has more than one simple machine is called a. simple machine b. complex machine c. compound machine

21. 20. A door stop is an example of a(n)… a. screw b. inclined plane c. wedge

22. 21. A piano needs to be moved to a third floor apartment, what simple machine would you use? a. lever b. incline plane c. fixed pulley

23. 22. What two simple machines make up the compound machine of a pair of scissors? a. lever and wedge b. lever and incline plane c. pulley and screw

24. 23. What is the disadvantage to using an inclined plane to move a heavy object? a. There is no disadvantage to using an inclined plane. b. An inclined plane makes you travel a farther distance to move an object. c. An inclined plane makes you use more force to move the object.

25. 24. Simple machines make work easier. a. true b. false

26. 25. You are going to chop some wood for a fire, what simple machine would you use? a. screw b. inclined plane c. wedge