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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. How can you figure out the mechanical advantage of most block and falls by glance?
2(pie)/pitch
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.

2. What type of lever provides a fractional mechanical advantage?
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.
Third class lever.
Magnify or reduce the force which you apply.

3. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time
Connects shafts having a 90 degree angle.

4. What is the second thing a gear can do?
Third class lever.
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
Door knob.

5. What is the formula for the wheel and axle?
Connects shafts having a 90 degree angle.
Work=Force*Distance
32/8 = 4
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

6. A miter gear connects what?
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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

7. What is the power formula?
Power=Work/Time
fulcrum- weight- effort
Door knob.
Increase or decrease the the speed of the applied motion.

8. The worm gear is a combination of what?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2(pie)/pitch
Magnify or reduce the force which you apply.
A screw and a spur gear.

9. hat is a screw?
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
A modification of an inclined plane.

10. What is the mechanical advantage for a single fixed block?
With oil - grease or soap.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
1

11. How do you measure power?
In Horsepower.
Connects shafts having a 90 degree angle.
Can change the direction of motion.
45

12. What is one type of second class lever?
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
A few thousandths of an inch.
Two surfaces move against one another.

13. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.

14. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
A modification of an inclined plane.

15. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
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 speed up the motion of resistence.
Opposite.

16. What is the theoretical mechanical advantage of any gear train?
Length of ramp/length of height from floor to truck
Opposite.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A screw and a spur gear.

17. Fractional mechanical advantage
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
1

18. Class two lever
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.
fulcrum- weight- effort
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

19. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.

20. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
With oil - grease or soap.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.

21. What is an example of a third class lever?
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The change of the direction of the pull.

22. What direction does the effort and resistance move in first class levers?
Opposite.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4

23. How do you find the mechanical advantage?
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.
With oil - grease or soap.
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.

24. What is another way to find the mechanical advantage of an inclined plane?
1
To magnify the applied force.
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck

25. Friction is involved when?
The change of the direction of the pull.
Two surfaces move against one another.
In pounds.
Count the number of parts of the rope going to and from the movable block.

26. The miter gear faces are beveled at what angle?
45
Connects shafts having a 90 degree angle.
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.

27. What is the work formula?
To speed up the motion of resistence.
Same.
Connects shafts having a 90 degree angle.
Work=Force*Distance

28. How is force measured in work?
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
In pounds.
Third class lever.

29. 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?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1
32/8 = 4
Power=Work/Time

30. What is the lever formula?
A screw and a spur gear.
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.
Feet.

31. What kind of machine is the inclined plane?
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil

32. The threads of a screw are cut so?
Can change the direction of motion.
Less than 1.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.

33. What is the purpose of a third class lever?
Work=Force*Distance
Positive mechanical advantage.
To speed up the motion of resistence.
Foot- pounds

34. What is the first thing a gear can do?
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
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.
Wheel and axle.

35. What are first and third class levers used for?
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.

36. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
Same.

37. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

38. What direction does the effort and resistance move in third class levers.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
1
Same.

39. What is the jack screw used for?
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
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

40. Work is measured in units also known as?
Feet.
Foot- pounds
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

41. What does a micrometer measure?
To raise a house or other heavy machinery.
Shafts lying at any given angle.
A few thousandths of an inch.
45

42. Formula for fractional mechanical disadvantage.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.

43. How is distance measured in work?
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
fulcrum- weight- effort
Feet.

44. With a single fixed sheave what is the only mechanical advantage?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
Count the number of parts of the rope going to and from the movable block.

45. An egg beater has a mechanical advantage of what?
Increase or decrease the the speed of the applied motion.
Less than 1.
In Horsepower.
fulcrum- weight- effort

46. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Opposite.
To speed up the motion of resistence.
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

47. What is the third thing a gear can do?
Equals the weight of the object being hoisted.
Same.
Magnify or reduce the force which you apply.
Two surfaces move against one another.

48. What direction does the effort and resistance move in the second class levers?
Count the number of parts of the rope going to and from the movable block.
Same.
Feet.
2. Each half of the rope carries an equal amount of weight.

49. The bevel gear is used to connect what?
With oil - grease or soap.
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.

50. What is another example of a wheel and axle?
To raise a house or other heavy machinery.
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.