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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?
32/8 = 4
Equals the weight of the object being hoisted.
Foot- pounds
your arm.

2. What is the work formula?
Two surfaces move against one another.
Same.
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil

3. What is the purpose of a third class lever?
To speed up the motion of resistence.
Foot- pounds
Can change the direction of motion.
The change of the direction of the pull.

4. How is work done?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

5. What does a micrometer measure?
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
A few thousandths of an inch.

6. What are the 4 forces?
Wheel and axle.
Foot- pounds
Gravity - Magnetism - Friction - Recoil
Opposite.

7. What direction does the effort and resistance move in first class levers?
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.
Opposite.
your arm.

8. What direction does the effort and resistance move in the second class levers?
Same.
A few thousandths of an inch.
Positive mechanical advantage.
Feet.

9. The threads of a screw are cut so?
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.

10. What is the jack screw used for?
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.

11. What is an example of a third class lever?
Simple machine
Work=Force*Distance
Opposite.
your arm.

12. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
To magnify the applied force.
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
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 is the lever formula?
Simple machine
Shafts lying at any given angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

14. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Same.
With oil - grease or soap.
Simple machine

15. A miter gear connects what?
Connects shafts having a 90 degree angle.
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.
To raise a house or other heavy machinery.

16. hat is a screw?
Power=Work/Time
A modification of an inclined plane.
Same.
Door knob.

17. The miter gear faces are beveled at what angle?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Third class lever.
45

18. How do you find the mechanical advantage?
Third class 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.
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.

19. How can you figure out the mechanical advantage of most block and falls by glance?
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.

20. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.

21. What is the power formula?
A modification of an inclined plane.
Shafts lying at any given angle.
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.

22. What kind of mechanical advantage does the first and second class lever provide?
Two surfaces move against one another.
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.
2. Each half of the rope carries an equal amount of weight.

23. How do you measure power?
Magnify or reduce the force which you apply.
In Horsepower.
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

24. Formula for fractional mechanical disadvantage.
Connects shafts having a 90 degree angle.
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.

25. The bevel gear is used to connect what?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Shafts lying at any given angle.

26. What is another way to find the mechanical advantage of an inclined plane?
To speed up the motion of resistence.
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.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.

27. What is the first thing a gear can do?
To speed up the motion of resistence.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45
Can change the direction of motion.

28. What direction does the effort and resistance move in third class levers.
your arm.
Shafts lying at any given angle.
Same.
45

29. How can you decrease friction on flat surfaces?
Door knob.
Same.
With oil - grease or soap.
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

30. Work is measured in units also known as?
Foot- pounds
your arm.
Door knob.
Magnify or reduce the force which you apply.

31. What is the theoretical mechanical advantage of any gear train?
32/8 = 4
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.

32. How is distance measured in work?
fulcrum- weight- effort
Feet.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

33. What are first and third class levers used for?
32/8 = 4
To magnify the applied force.
2(pie)/pitch
Direction - speed or size of the force applied.

34. Class two lever
32/8 = 4
Equals the weight of the object being hoisted.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort

35. What kind of machine is the inclined plane?
Simple machine
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.
Work=Force*Distance

36. Friction is involved when?
Same.
When a resistance is overcome by a force acting through a measurable distance.
Two surfaces move against one another.
Foot- pounds

37. What is the second thing a gear can do?
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.
Increase or decrease the the speed of the applied motion.
Same.

38. An egg beater has a mechanical advantage of what?
Less than 1.
Equals the weight of the object being hoisted.
Simple machine
Shafts lying at any given angle.

39. How is force measured in work?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
In Horsepower.

40. What is the third thing a gear can do?
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
Same.

41. What is another example of a wheel and axle?
Shafts lying at any given angle.
Two surfaces move against one another.
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.

42. What type of lever provides a fractional mechanical advantage?
Third class lever.
Foot- pounds
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

43. What is one type of second class lever?
Opposite.
Wheel and axle.
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.

44. Fractional mechanical advantage
fulcrum- weight- effort
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds

45. What is the mechanical advantage for a single fixed block?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort

46. 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.
Third class lever.
2(pie)/pitch
Length of ramp/length of height from floor to truck

47. The worm gear is a combination of what?
A screw and a spur gear.
In pounds.
1
Direction - speed or size of the force applied.

48. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Work=Force*Distance
Equals the weight of the object being hoisted.
32/8 = 4
A modification of an inclined plane.

49. What is the formula for the mechanical advantage of a screw?
Work=Force*Distance
2(pie)/pitch
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

50. What is the formula for the wheel and axle?
Connects shafts having a 90 degree angle.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.
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