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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. A miter gear connects what?
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.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

2. What direction does the effort and resistance move in the second class levers?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
32/8 = 4
2(pie)/pitch
Same.

3. Work is measured in units also known as?
A modification of an inclined plane.
Feet.
Foot- pounds
Less than 1.

4. hat is a screw?
A modification of an inclined plane.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To speed up the motion of resistence.

5. What is the mechanical advantage for a single fixed block?
Direction - speed or size of the force applied.
2(pie)/pitch
32/8 = 4
1

6. What are the 4 forces?
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch
A few thousandths of an inch.

7. What does a micrometer measure?
2. Each half of the rope carries an equal amount of weight.
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 few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

8. The bevel gear is used to connect what?
Opposite.
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.

9. Gears can do a job for you by changing what three things?
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.

10. Formula for fractional mechanical disadvantage.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch
Length of ramp/length of height from floor to truck

11. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

12. What is the power formula?
Magnify or reduce the force which you apply.
Simple machine
To magnify the applied force.
Power=Work/Time

13. With a single fixed sheave what is the only mechanical advantage?
Direction - speed or size of the force applied.
32/8 = 4
In Horsepower.
The change of the direction of the pull.

14. What direction does the effort and resistance move in third class levers.
The force used to overcome friction is greater than the force used to do useful work.
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.
Same.

15. What is the lever formula?
fulcrum- weight- effort
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time
Increase or decrease the the speed of the applied motion.

16. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
Two surfaces move against one another.
32/8 = 4

17. What is one type of second class lever?
A few thousandths of an inch.
Wheel and axle.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

18. What is the third thing a gear can do?
Equals the weight of the object being hoisted.
In Horsepower.
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.

19. How is distance measured in work?
In pounds.
Two surfaces move against one another.
Feet.
1

20. What is the work formula?
Work=Force*Distance
Power=Work/Time
Same.
Same.

21. What is the second thing a gear can do?
Third class lever.
Increase or decrease the the speed of the applied motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To raise a house or other heavy machinery.

22. What direction does the effort and resistance move in first class levers?
In pounds.
Opposite.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.

23. How can you decrease friction on flat surfaces?
Door knob.
With oil - grease or soap.
Same.
To speed up the motion of resistence.

24. What is another way to find the mechanical advantage of an inclined plane?
A few thousandths of an inch.
Same.
Length of ramp/length of height from floor to truck
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

25. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
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.
Length of ramp/length of height from floor to truck

26. What is the formula for the mechanical advantage of a screw?
45
2(pie)/pitch
To speed up the motion of resistence.
Shafts lying at any given angle.

27. What kind of machine is the inclined plane?
Mechanical disadvantage. Use more force than the force of the load you lift.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Count the number of parts of the rope going to and from the movable block.

28. How is force measured in work?
Magnify or reduce the force which you apply.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

29. What is another example of a wheel and axle?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Door knob.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

30. 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?
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
fulcrum- weight- effort
Equals the weight of the object being hoisted.

31. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.

32. An egg beater has a mechanical advantage of what?
Foot- pounds
Same.
Less than 1.
Equals the weight of the object being hoisted.

33. 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.
Foot- pounds
Simple machine
fulcrum- weight- effort

34. What is the purpose of a third class lever?
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Length of ramp/length of height from floor to truck

35. Class two lever
Door knob.
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.
Opposite.
fulcrum- weight- effort

36. What are first and third class levers used for?
Same.
2(pie)/pitch
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.

37. Friction is involved when?
Direction - speed or size of the force applied.
In Horsepower.
Two surfaces move against one another.
Foot- pounds

38. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Third class lever.

39. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

40. The worm gear is a combination of what?
A screw and a spur gear.
Work=Force*Distance
Shafts lying at any given angle.
To speed up the motion of resistence.

41. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Length of ramp/length of height from floor to truck
In pounds.
A modification of an inclined plane.
Equals the weight of the object being hoisted.

42. What is the first thing a gear can do?
Third class lever.
2. Each half of the rope carries an equal amount of weight.
Can change the direction of motion.
Wheel and axle.

43. What type of lever provides a fractional mechanical advantage?
Opposite.
Positive mechanical advantage.
Third class lever.
Equals the weight of the object being hoisted.

44. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.

45. What is the formula for the wheel and axle?
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.
Less than 1.
fulcrum- weight- effort
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

46. The miter gear faces are beveled at what angle?
A few thousandths of an inch.
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.
45

47. 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.
Feet.
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.

48. What is an example of a third class lever?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
your arm.
45

49. What is the mechanical advantage of a single movable block?
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.

50. What is the jack screw used for?
your arm.
32/8 = 4
To raise a house or other heavy machinery.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.