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Science Lever and Pulley/ Wedge
Created by ftbrady
- 1. the fixed point which a lever turns on is called
- 2. other than multiplying a force, what else can levers do
- 3. how would you determine what class a lever is
- 4. what happens to the force needed to move an object as you increase the length of effort arm
- 5. what would happen to the force required if you decreased the length of the effort arm?
- 6. ALL LEVERS make work easier
- 7. pulleys can_____ a force or change is ______
- 8. 3 types of pulleys
- 9. how do you find the mechanical advantage of a block and tackle
- 10. ALL PULLEYS make work easier
- 11. how does the distance of the string you pull compare to the distance the weight if lifted when using a block and tackle system
- 12. what is the MA of a single fixed pulley?
- 13. what is the MA of a single moveable pulley
- 14. what makes something a compound machine instead of a SM
- 15. label each machine S simple or C compound
- 16. list 3 of your own examples of CM
- 17. mechanical advantage is how much the machine _____ your force
- 18. what does it mean about a machine if it has a mechanical advantage of 1
- 19. would machines with higher mechanical advantage take more or less effort force to make some move
- 20. would machines with higher mechanical advantage take more or less work to make something move
- 21. if you have a choice between a machine with a MA of 4 and a machine with an MA of 6, which machine would it make more sense to use
- 22. objects with larger radius_______, object with smaller radius ________
- 23. what would take less force to turn an axle with a diameter of 10 cm using a 50 cm or a 100 cm wheel
- 24. why would the 100 cm wheel be easier
- 25. what would require the least amount of work to turn axle with diameter of 10 cm using 50 or 100 cm wheel
- 26. what is a specific advantage of using a screw instead of an inclined plane
- 27. what does the wedge do as it moves into a matereial
- 28. what is the major difference between the wedge and an inclined plane
- 29. if you have 2 wedges that are 8 cm on top but A is shorter than B which would require the least amount of force
- 30. What is the rule for question 29
- a. ________, ________,____________
- b. MA of 6 ; you would not have to use as much effort force
- c. B it has a greater distance (length)
- d. force needed would decrease as you increase the effort arm
- e. it has a larger wheel and when you increase the effort distance, you decrease the effort force needed
- f. direction
- g. count the sections of rope supporting the weight
- h. multipplies
- i. change the direction of a force
- j. the machine doesn't increase your effort/input force; the force the machine applies to an object is the same as the force you put in. It doesn't help you by making you stronger
- k. scissors___ramp___single fixed pulley____ pry bar____ bicycle____ shovel____
- l. composed of 2 or more SM
- m. 1
- n. both amounts of work are the same due to the axles being the same. the 100 would be easier as it travels a greater distance
- o. false; they only change the direction and force
- p. the force needed would increase
- q. the wedge moves
- r. less
- s. more with friction
- t. axle with a diameter of 10 cm using a 100 cm wheel
- u. fulcrum
- v. completing the same goal using a smaller space
- w. wheel; axle
- x. look in the middle and be FRE; fulcrum in middle=class 1, resistance in middle = 2; effort in the middle = class 3
- y. the distance of the string you pull is much greater than the distance the object is lifted; trading increased distance for decreased force.
- z. false; the 3rd class lever does not make work easier; They give you increased speed
- aa. 2
- ab. When you increase the distance, you decrease the force (makes work easier)
- ac. single movable, single fixed, block and tackle
- ad. separates the material
Science Lever and Pulley/ Wedge (Answer Key)
Created by ftbrady
- u 1. the fixed point which a lever turns on is called
- i 2. other than multiplying a force, what else can levers do
- x 3. how would you determine what class a lever is
- d 4. what happens to the force needed to move an object as you increase the length of effort arm
- p 5. what would happen to the force required if you decreased the length of the effort arm?
- z 6. ALL LEVERS make work easier
- f 7. pulleys can_____ a force or change is ______
- } 8. 3 types of pulleys
- g 9. how do you find the mechanical advantage of a block and tackle
- o 10. ALL PULLEYS make work easier
- y 11. how does the distance of the string you pull compare to the distance the weight if lifted when using a block and tackle system
- m 12. what is the MA of a single fixed pulley?
- { 13. what is the MA of a single moveable pulley
- l 14. what makes something a compound machine instead of a SM
- k 15. label each machine S simple or C compound
- a 16. list 3 of your own examples of CM
- h 17. mechanical advantage is how much the machine _____ your force
- j 18. what does it mean about a machine if it has a mechanical advantage of 1
- r 19. would machines with higher mechanical advantage take more or less effort force to make some move
- s 20. would machines with higher mechanical advantage take more or less work to make something move
- b 21. if you have a choice between a machine with a MA of 4 and a machine with an MA of 6, which machine would it make more sense to use
- w 22. objects with larger radius_______, object with smaller radius ________
- t 23. what would take less force to turn an axle with a diameter of 10 cm using a 50 cm or a 100 cm wheel
- e 24. why would the 100 cm wheel be easier
- n 25. what would require the least amount of work to turn axle with diameter of 10 cm using 50 or 100 cm wheel
- v 26. what is a specific advantage of using a screw instead of an inclined plane
- ad 27. what does the wedge do as it moves into a matereial
- `q 28. what is the major difference between the wedge and an inclined plane
- `c 29. if you have 2 wedges that are 8 cm on top but A is shorter than B which would require the least amount of force
- ab 30. What is the rule for question 29
- a. ________, ________,____________
- b. MA of 6 ; you would not have to use as much effort force
- c. B it has a greater distance (length)
- d. force needed would decrease as you increase the effort arm
- e. it has a larger wheel and when you increase the effort distance, you decrease the effort force needed
- f. direction
- g. count the sections of rope supporting the weight
- h. multipplies
- i. change the direction of a force
- j. the machine doesn't increase your effort/input force; the force the machine applies to an object is the same as the force you put in. It doesn't help you by making you stronger
- k. scissors___ramp___single fixed pulley____ pry bar____ bicycle____ shovel____
- l. composed of 2 or more SM
- m. 1
- n. both amounts of work are the same due to the axles being the same. the 100 would be easier as it travels a greater distance
- o. false; they only change the direction and force
- p. the force needed would increase
- q. the wedge moves
- r. less
- s. more with friction
- t. axle with a diameter of 10 cm using a 100 cm wheel
- u. fulcrum
- v. completing the same goal using a smaller space
- w. wheel; axle
- x. look in the middle and be FRE; fulcrum in middle=class 1, resistance in middle = 2; effort in the middle = class 3
- y. the distance of the string you pull is much greater than the distance the object is lifted; trading increased distance for decreased force.
- z. false; the 3rd class lever does not make work easier; They give you increased speed
- aa. 2
- ab. When you increase the distance, you decrease the force (makes work easier)
- ac. single movable, single fixed, block and tackle
- ad. separates the material
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