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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 is the formula for the mechanical advantage of a screw?
To raise a house or other heavy machinery.
2(pie)/pitch
fulcrum- weight- effort
A screw and a spur gear.

2. 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?
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.
fulcrum- weight- effort
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.

3. What kind of machine is the inclined plane?
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.
Simple machine
Door knob.

4. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Shafts lying at any given angle.
Power=Work/Time
To magnify the applied force.
Equals the weight of the object being hoisted.

5. Class two lever
fulcrum- weight- effort
Foot- pounds
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Wheel and axle.

6. With a single fixed sheave what is the only mechanical advantage?
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
The change of the direction of the pull.

7. How can you figure out the mechanical advantage of most block and falls by glance?
In pounds.
Magnify or reduce the force which you apply.
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

8. What is the theoretical mechanical advantage of any gear train?
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To raise a house or other heavy machinery.

9. What direction does the effort and resistance move in third class levers.
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Same.
In pounds.

10. What direction does the effort and resistance move in the second class levers?
With oil - grease or soap.
Same.
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.

11. Work is measured in units also known as?
1
A screw and a spur gear.
Connects shafts having a 90 degree angle.
Foot- pounds

12. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Magnify or reduce the force which you apply.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.

13. What is the third thing a gear can do?
The force used to overcome friction is greater than the force used to do useful work.
Same.
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
Magnify or reduce the force which you apply.

14. Friction is involved when?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Two surfaces move against one another.

15. What is the first thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
Can change the direction of motion.
A modification of an inclined plane.

16. An egg beater has a mechanical advantage of what?
A few thousandths of an inch.
Less than 1.
Simple machine
To raise a house or other heavy machinery.

17. How is force measured in work?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
Two surfaces move against one another.
Third class lever.

18. What is the formula for the wheel and axle?
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
A few thousandths of an inch.
Power=Work/Time

19. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
Can change the direction of motion.
In pounds.

20. hat is a screw?
Simple machine
A modification of an inclined plane.
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.

21. What is the work formula?
Positive mechanical advantage.
Work=Force*Distance
1
Power=Work/Time

22. A miter gear connects what?
Connects shafts having a 90 degree angle.
The change of the direction of the pull.
Door knob.
With oil - grease or soap.

23. What is an example of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Equals the weight of the object being hoisted.
Simple machine

24. The miter gear faces are beveled at what angle?
Simple machine
45
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.

25. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
Simple machine

26. How do you measure power?
Positive mechanical advantage.
Magnify or reduce the force which you apply.
Feet.
In Horsepower.

27. What is the second thing a gear can do?
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.
32/8 = 4
Power=Work/Time

28. What type of lever provides a fractional mechanical advantage?
Same.
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.

29. The bevel gear is used to connect what?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
Positive mechanical advantage.
Shafts lying at any given angle.

30. What is the jack screw used for?
To raise a house or other heavy machinery.
Less than 1.
To magnify the applied force.
A few thousandths of an inch.

31. What is one type of second class lever?
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
Two surfaces move against one another.
In pounds.

32. What does a micrometer measure?
A few thousandths of an inch.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

33. What is another way to find the mechanical advantage of an inclined plane?
Feet.
A screw and a spur gear.
Length of ramp/length of height from floor to truck
In pounds.

34. The threads of a screw are cut so?
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.
The force used to overcome friction is greater than the force used to do useful work.

35. How is distance measured in work?
With oil - grease or soap.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
Feet.

36. Formula for fractional mechanical disadvantage.
Connects shafts having a 90 degree angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

37. 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.
1
Count the number of parts of the rope going to and from the movable block.
Feet.

38. The worm gear is a combination of what?
In pounds.
45
Simple machine
A screw and a spur gear.

39. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

40. How can you decrease friction on flat surfaces?
With oil - grease or soap.
45
Two surfaces move against one another.
Power=Work/Time

41. What is the power formula?
fulcrum- weight- effort
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

42. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.

43. Gears can do a job for you by changing what three things?
Magnify or reduce the force which you apply.
Same.
Direction - speed or size of the force applied.
Shafts lying at any given angle.

44. What direction does the effort and resistance move in first class levers?
In pounds.
Can change the direction of motion.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

45. What is the mechanical advantage for a single fixed block?
Less than 1.
A modification of an inclined plane.
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

46. What is the ratio of any gear train?
Opposite.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Increase or decrease the the speed of the applied motion.
Foot- pounds

47. How is work done?
2. Each half of the rope carries an equal amount of weight.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort

48. What is the purpose of a third class lever?
Positive mechanical advantage.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
Count the number of parts of the rope going to and from the movable block.

49. What are first and third class levers used for?
To magnify the applied force.
Direction - speed or size of the force applied.
Positive mechanical advantage.
Shafts lying at any given angle.

50. What is another example of a wheel and axle?
Direction - speed or size of the force applied.
Door knob.
Equals the weight of the object being hoisted.
Same.