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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.
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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. 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?
Less than 1.
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
Increase or decrease the the speed of the applied motion.

2. What is the jack screw used for?
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.

3. What are first and third class levers used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
Simple machine
Third class lever.

4. The worm gear is a combination of what?
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.
Magnify or reduce the force which you apply.
A screw and a spur gear.

5. 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.
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.

6. What are the 4 forces?
1
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

7. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
1
Can change the direction of motion.
In Horsepower.

8. What is the formula for the mechanical advantage of a screw?
With oil - grease or soap.
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

9. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
45
Length of ramp/length of height from floor to truck
Foot- pounds

10. What type of lever provides a fractional mechanical advantage?
Opposite.
Third class lever.
Positive mechanical advantage.
Connects shafts having a 90 degree angle.

11. 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.
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
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. How is force measured in work?
32/8 = 4
In pounds.
Two surfaces move against one another.
A few thousandths of an inch.

13. The miter gear faces are beveled at what angle?
2. Each half of the rope carries an equal amount of weight.
45
A modification of an inclined plane.
The rope that passes through your hands is greater than the distance that the load is raised.

14. What is an example of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
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

15. Work is measured in units also known as?
Foot- pounds
The force used to overcome friction is greater than the force used to do useful work.
Door knob.
Simple machine

16. What is the work formula?
Work=Force*Distance
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
Equals the weight of the object being hoisted.

17. What is one type of second 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.
Wheel and axle.
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.

18. What does a micrometer measure?
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
Same.
To magnify the applied force.
A few thousandths of an inch.

19. How is distance measured in work?
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.
Feet.
Door knob.

20. hat is a screw?
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.

21. A miter gear connects what?
Same.
Connects shafts having a 90 degree angle.
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

22. Gears can do a job for you by changing what three things?
Door knob.
Shafts lying at any given angle.
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.

23. What is the power formula?
Opposite.
Power=Work/Time
Feet.
Foot- pounds

24. What direction does the effort and resistance move in first class levers?
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
Wheel and axle.
Opposite.

25. Friction is involved when?
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
Two surfaces move against one another.

26. With a single fixed sheave what is the only mechanical advantage?
Connects shafts having a 90 degree angle.
Same.
To raise a house or other heavy machinery.
The change of the direction of the pull.

27. Class two lever
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
Less than 1.
fulcrum- weight- effort

28. How can you figure out the mechanical advantage of most block and falls by glance?
45
Count the number of parts of the rope going to and from the movable block.
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
Opposite.

29. What is the purpose of a third class lever?
In Horsepower.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort

30. Formula for fractional mechanical disadvantage.
Positive mechanical advantage.
In pounds.
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

31. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
Simple machine
A modification of an inclined plane.

32. What is the mechanical advantage for a single fixed block?
Door knob.
1
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.

33. What is the first thing a gear can do?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.

34. What direction does the effort and resistance move in the second class levers?
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
Two surfaces move against one another.

35. What kind of mechanical advantage does the first and second class lever provide?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.

36. What is the mechanical advantage of a single movable block?
Door knob.
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.

37. What is another way to find the mechanical advantage of an inclined plane?
To magnify the applied force.
Length of ramp/length of height from floor to truck
A few thousandths of an inch.
In pounds.

38. What kind of machine is the inclined plane?
Simple machine
Direction - speed or size of the force applied.
Shafts lying at any given angle.
Work=Force*Distance

39. How can you decrease friction on flat surfaces?
With oil - grease or soap.
In pounds.
fulcrum- weight- effort
Work=Force*Distance

40. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
Simple machine

41. An egg beater has a mechanical advantage of what?
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.

42. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
With oil - grease or soap.

43. What direction does the effort and resistance move in third class levers.
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.
Shafts lying at any given angle.
With oil - grease or soap.

44. How do you measure power?
In Horsepower.
1
Direction - speed or size of the force applied.
A modification of an inclined plane.

45. How do you find the mechanical advantage?
A few thousandths of an inch.
A screw and a spur gear.
Two surfaces move against one another.
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.

46. What is another example of a wheel and axle?
Can change the direction of motion.
Work=Force*Distance
Door knob.
A screw and a spur gear.

47. The threads of a screw are cut so?
Same.
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.

48. What is the lever formula?
Opposite.
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
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.

49. 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.
The change of the direction of the pull.
Wheel and axle.
Less than 1.

50. The bevel gear is used to connect what?
Shafts lying at any given angle.
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck