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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. The worm gear is a combination of what?
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
Positive mechanical advantage.
In pounds.
A screw and a spur gear.

2. An egg beater has a mechanical advantage of what?
Shafts lying at any given angle.
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
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

3. What kind of mechanical advantage does the first and second class lever provide?
Work=Force*Distance
Positive mechanical advantage.
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

4. How do you measure power?
45
In Horsepower.
1
Shafts lying at any given angle.

5. What is an example of a third class lever?
Count the number of parts of the rope going to and from the movable block.
your arm.
fulcrum- weight- effort
A few thousandths of an inch.

6. The miter gear faces are beveled at what angle?
45
Connects shafts having a 90 degree angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Less than 1.

7. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Foot- pounds
Shafts lying at any given angle.
The rope that passes through your hands is greater than the distance that the load is raised.
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

8. What is the theoretical mechanical advantage 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.
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.
Work=Force*Distance

9. Work is measured in units also known as?
Foot- pounds
45
In pounds.
1

10. What is another example of a wheel and axle?
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
Door knob.

11. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

12. The threads of a screw are cut so?
Can change the direction of motion.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.

13. A miter gear connects what?
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
Feet.
32/8 = 4

14. What is the second thing a gear can do?
With oil - grease or soap.
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.

15. The bevel gear is used to connect what?
Shafts lying at any given angle.
Direction - speed or size of the force applied.
The rope that passes through your hands is greater than the distance that the load is raised.
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

16. What is the work formula?
Same.
fulcrum- weight- effort
Work=Force*Distance
2(pie)/pitch

17. Class two lever
1
fulcrum- weight- effort
The change of the direction of the pull.
Can change the direction of motion.

18. How is force measured in work?
Door knob.
In pounds.
Same.
Connects shafts having a 90 degree angle.

19. Fractional mechanical advantage
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
Two surfaces move against one another.

20. What is the mechanical advantage of a single movable block?
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
Feet.
Connects shafts having a 90 degree angle.

21. What is the power formula?
Power=Work/Time
Door knob.
1
Direction - speed or size of the force applied.

22. How can you figure out the mechanical advantage of most block and falls by glance?
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.
Third class lever.
In pounds.

23. What is the purpose of a third class lever?
Third class lever.
In Horsepower.
Same.
To speed up the motion of resistence.

24. What type of lever provides a fractional mechanical advantage?
Third class lever.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
Shafts lying at any given angle.

25. How is work done?
Power=Work/Time
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.

26. hat is a screw?
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
With oil - grease or soap.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

27. What are first and third class levers used for?
To magnify the applied force.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Same.

28. What is the mechanical advantage for a single fixed block?
Opposite.
To raise a house or other heavy machinery.
Door knob.
1

29. Friction is involved when?
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
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
Third class lever.

30. What kind of machine is the inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
Feet.
Less than 1.
Simple machine

31. What is the ratio of any gear train?
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.
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.

32. What direction does the effort and resistance move in the second class levers?
The change of the direction of the pull.
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.
Positive mechanical advantage.
Same.

33. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Simple machine
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.

34. What is the formula for the wheel and axle?
32/8 = 4
Connects shafts having a 90 degree angle.
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
With oil - grease or soap.

35. Gears can do a job for you by changing what three things?
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.

36. How is distance measured in work?
2. Each half of the rope carries an equal amount of weight.
Less than 1.
Feet.
your arm.

37. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
Same.
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.
The change of the direction of the pull.

38. What are the 4 forces?
Same.
Simple machine
Gravity - Magnetism - Friction - Recoil
Power=Work/Time

39. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Increase or decrease the the speed of the applied motion.

40. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.

41. What does a micrometer measure?
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
A few thousandths of an inch.

42. What is the third thing a gear can do?
Feet.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.

43. What direction does the effort and resistance move in first class levers?
A screw and a spur gear.
Opposite.
To magnify the applied force.
Shafts lying at any given angle.

44. What is the formula for the mechanical advantage of a screw?
Same.
45
2(pie)/pitch
The change of the direction of the pull.

45. 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.
Simple machine
32/8 = 4
Same.

46. How do you find the mechanical advantage?
Connects shafts having a 90 degree angle.
Positive mechanical advantage.
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
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.

47. Formula for fractional mechanical disadvantage.
Door knob.
Shafts lying at any given angle.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

48. What is one type of second class lever?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
Third class lever.
Count the number of parts of the rope going to and from the movable block.

49. What is the jack screw used for?
Two surfaces move against one another.
Wheel and axle.
Positive mechanical advantage.
To raise a house or other heavy machinery.

50. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Opposite.
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