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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. What kind of machine is the inclined plane?
Door knob.
2(pie)/pitch
Wheel and axle.
Simple machine

2. How do you find the mechanical advantage?
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.
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.

3. What is the formula for the mechanical advantage of a screw?
Connects shafts having a 90 degree angle.
32/8 = 4
Length of ramp/length of height from floor to truck
2(pie)/pitch

4. An egg beater has a mechanical advantage of what?
Third class lever.
Less than 1.
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

5. What is another way to find the mechanical advantage of an inclined plane?
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

6. What is the first thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.
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.
Power=Work/Time

7. Work is measured in units also known as?
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.
Two surfaces move against one another.
Foot- pounds

8. Class two lever
fulcrum- weight- effort
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

9. What is the work formula?
Work=Force*Distance
To raise a house or other heavy machinery.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

10. The bevel gear is used to connect what?
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

11. What is the jack screw used for?
2(pie)/pitch
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.

12. What is the mechanical advantage for a single fixed block?
Gravity - Magnetism - Friction - Recoil
1
The change of the direction of the pull.
Less than 1.

13. What is the formula for the wheel and axle?
Same.
32/8 = 4
Increase or decrease the the speed of the applied motion.
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

14. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.
Equals the weight of the object being hoisted.
A screw and a spur gear.

15. What is an example of a third class lever?
With oil - grease or soap.
your arm.
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 the driven gears/ divided by the product of the number of teeth on the driver gears.

16. The worm gear is a combination of what?
45
A screw and a spur gear.
The change of the direction of the pull.
In pounds.

17. 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.
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.

18. How can you decrease friction on flat surfaces?
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.
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.

19. What is the ratio of any gear train?
32/8 = 4
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.
Count the number of parts of the rope going to and from the movable block.

20. What is the power formula?
Feet.
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.
2(pie)/pitch

21. What is the second thing a gear can do?
Shafts lying at any given angle.
Positive mechanical advantage.
Foot- pounds
Increase or decrease the the speed of the applied motion.

22. What direction does the effort and resistance move in third class levers.
fulcrum- weight- effort
2(pie)/pitch
A modification of an inclined plane.
Same.

23. 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.
Length of ramp/length of height from floor to truck
With oil - grease or soap.
Power=Work/Time

24. 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?
Feet.
32/8 = 4
Length of ramp/length of height from floor to truck
Simple machine

25. What is the lever formula?
Work=Force*Distance
2(pie)/pitch
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.

26. How is force measured in work?
In pounds.
Positive mechanical advantage.
To speed up the motion of resistence.
Foot- pounds

27. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.

28. A miter gear connects what?
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
Opposite.
Work=Force*Distance

29. How is distance measured in work?
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance
Feet.
When a resistance is overcome by a force acting through a measurable distance.

30. Friction is involved when?
Less than 1.
Two surfaces move against one another.
Equals the weight of the object being hoisted.
Third class lever.

31. What direction does the effort and resistance move in first class levers?
2(pie)/pitch
Can change the direction of motion.
Connects shafts having a 90 degree angle.
Opposite.

32. What type of lever provides a fractional mechanical advantage?
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Work=Force*Distance
Door knob.

33. How do you measure power?
A few thousandths of an inch.
In Horsepower.
With oil - grease or soap.
Foot- pounds

34. What kind of mechanical advantage does the first and second class lever provide?
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
The change of the direction of the pull.
32/8 = 4

35. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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.
To raise a house or other heavy machinery.
In Horsepower.

36. What is the third thing a gear can do?
Positive mechanical advantage.
A modification of an inclined plane.
Magnify or reduce the force which you apply.
Same.

37. What are first and third class levers used for?
Opposite.
To magnify the applied force.
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.

38. What does a micrometer measure?
Work=Force*Distance
Increase or decrease the the speed of the applied motion.
1
A few thousandths of an inch.

39. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
Simple machine
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. What direction does the effort and resistance move in the second class levers?
To speed up the motion of resistence.
Same.
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

41. How can you figure out the mechanical advantage of most block and falls by glance?
Magnify or reduce the force which you apply.
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.

42. hat is a screw?
Same.
In pounds.
A modification of an inclined plane.
Can change the direction of motion.

43. Fractional mechanical advantage
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.
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.

44. What is the purpose of a third class lever?
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.
1
Two surfaces move against one another.

45. What is the mechanical advantage of a single movable block?
Simple machine
Opposite.
Third class lever.
2. Each half of the rope carries an equal amount of weight.

46. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Two surfaces move against one another.
Wheel and axle.
A modification of an inclined plane.

47. Formula for fractional mechanical disadvantage.
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.
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

48. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To raise a house or other heavy machinery.
Feet.
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.

49. How is work done?
your arm.
45
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.

50. The miter gear faces are beveled at what angle?
Can change the direction of motion.
To magnify the applied force.
45
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