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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the formula for the mechanical advantage of a screw?
Feet.
Equals the weight of the object being hoisted.
Third class lever.
2(pie)/pitch

2. What is the work formula?
32/8 = 4
45
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.

3. What direction does the effort and resistance move in first class levers?
Opposite.
1
Foot- pounds
Direction - speed or size of the force applied.

4. What are first and third class levers used for?
To magnify the applied force.
To raise a house or other heavy machinery.
With oil - grease or soap.
Foot- pounds

5. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To raise a house or other heavy machinery.
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck

6. What is the lever formula?
Wheel and axle.
Positive mechanical advantage.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. What is the mechanical advantage of a single movable block?
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
Third class lever.
To raise a house or other heavy machinery.

8. With a single fixed sheave what is the only mechanical advantage?
Simple machine
A modification of an inclined plane.
Length of ramp/length of height from floor to truck
The change of the direction of the pull.

9. How can you figure out the mechanical advantage of most block and falls by glance?
fulcrum- weight- effort
A screw and a spur gear.
In pounds.
Count the number of parts of the rope going to and from the movable block.

10. Belt drive Gear 1 has 32 teeth and gear 2 and 3 have 8 teeth - for 1 revolution that gear 1 makes how many revolutions do gears 2 and 3 make?
32/8 = 4
Feet.
A screw and a spur gear.
Two surfaces move against one another.

11. What is the first thing a gear can do?
The change of the direction of the pull.
Less than 1.
Can change the direction of motion.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle

12. What is the jack screw used for?
To raise a house or other heavy machinery.
1
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

13. What kind of machine is the inclined plane?
Less than 1.
The change of the direction of the pull.
In pounds.
Simple machine

14. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Opposite.
With oil - grease or soap.
Work=Force*Distance

15. What is an example of a third class lever?
A screw and a spur gear.
Simple machine
Third class lever.
your arm.

16. What are the 4 forces?
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
Two surfaces move against one another.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil

17. What type of lever provides a fractional mechanical advantage?
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Can change the direction of motion.
Third class lever.

18. What direction does the effort and resistance move in third class levers.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
32/8 = 4
Same.
Less than 1.

19. hat is a screw?
fulcrum- weight- effort
Simple machine
A modification of an inclined plane.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle

20. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds
your arm.
Increase or decrease the the speed of the applied motion.

21. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Third class lever.

22. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
Equals the weight of the object being hoisted.

23. Fractional mechanical advantage
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. How is work done?
To raise a house or other heavy machinery.
Same.
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

25. A miter gear connects what?
Count the number of parts of the rope going to and from the movable block.
1
The rope that passes through your hands is greater than the distance that the load is raised.
Connects shafts having a 90 degree angle.

26. How do you find the mechanical advantage?
Simple machine
45
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

27. What direction does the effort and resistance move in the second class levers?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
With oil - grease or soap.
Same.

28. Class two lever
Simple machine
fulcrum- weight- effort
In Horsepower.
your arm.

29. What is the mechanical advantage for a single fixed block?
fulcrum- weight- effort
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1

30. Friction is involved when?
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.

31. How is force measured in work?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.
In pounds.
fulcrum- weight- effort

32. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
32/8 = 4
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

33. What is the formula for the wheel and axle?
Third class lever.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.

34. How is distance measured in work?
Can change the direction of motion.
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

35. What is the purpose of a third class lever?
1
Power=Work/Time
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.

36. The worm gear is a combination of what?
To raise a house or other heavy machinery.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

37. The bevel gear is used to connect what?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.

38. The miter gear faces are beveled at what angle?
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
45

39. How do you measure power?
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.
In Horsepower.
45

40. What is the theoretical mechanical advantage of any gear train?
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.
Work=Force*Distance

41. An egg beater has a mechanical advantage of what?
Less than 1.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
To magnify the applied force.

42. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Door knob.
The change of the direction of the pull.
Length of ramp/length of height from floor to truck

43. What is the power formula?
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
Foot- pounds

44. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds
Feet.
Same.

45. What is the second thing a gear can do?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

46. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
your arm.
To speed up the motion of resistence.
Less than 1.

47. How can you decrease friction on flat surfaces?
A screw and a spur gear.
With oil - grease or soap.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

48. What does a micrometer measure?
To raise a house or other heavy machinery.
Can change the direction of motion.
A few thousandths of an inch.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.

49. What is another example of a wheel and axle?
Equals the weight of the object being hoisted.
1
45
Door knob.

50. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
In Horsepower.