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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?
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
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

2. How can you decrease friction on flat surfaces?
Less than 1.
2(pie)/pitch
With oil - grease or soap.
Equals the weight of the object being hoisted.

3. What is another way to find the mechanical advantage of an inclined plane?
A modification of an inclined plane.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck
Foot- pounds

4. What does a micrometer measure?
Connects shafts having a 90 degree angle.
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.
Work=Force*Distance
A few thousandths of an inch.

5. What direction does the effort and resistance move in first class levers?
Opposite.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

6. The bevel gear is used to connect what?
Shafts lying at any given angle.
A few thousandths of an inch.
A modification of an inclined plane.
Same.

7. An egg beater has a mechanical advantage of what?
In Horsepower.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
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.

8. What is one type of second class lever?
Third class lever.
Increase or decrease the the speed of the applied motion.
Opposite.
Wheel and axle.

9. A miter gear connects what?
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
Opposite.

10. The threads of a screw are cut so?
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.
Same.
The force used to overcome friction is greater than the force used to do useful work.

11. How is force measured in work?
Work=Force*Distance
Wheel and axle.
A modification of an inclined plane.
In pounds.

12. What is the work formula?
To raise a house or other heavy machinery.
To magnify the applied force.
Work=Force*Distance
Equals the weight of the object being hoisted.

13. What is the mechanical advantage of a single movable block?
Work=Force*Distance
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.
In pounds.
2. Each half of the rope carries an equal amount of weight.

14. 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?
In pounds.
Door knob.
Gravity - Magnetism - Friction - Recoil
32/8 = 4

15. What is an example of a third class lever?
The change of the direction of the pull.
A few thousandths of an inch.
Work=Force*Distance
your arm.

16. What type of lever provides a fractional mechanical advantage?
Door knob.
To speed up the motion of resistence.
Third class lever.
A modification of an inclined plane.

17. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
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
Third class lever.

18. What is another example of a wheel and axle?
Simple machine
Wheel and axle.
Door knob.
Can change the direction of motion.

19. What is the third thing a gear can do?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Opposite.
Magnify or reduce the force which you apply.
Simple machine

20. How do you find the mechanical advantage?
32/8 = 4
Same.
Direction - speed or size of the force applied.
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.

21. 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.
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
fulcrum- weight- effort
45

22. What kind of mechanical advantage does the first and second class lever provide?
Feet.
Positive mechanical advantage.
Simple machine
To raise a house or other heavy machinery.

23. The miter gear faces are beveled at what angle?
45
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.
Magnify or reduce the force which you apply.

24. What are first and third class levers used for?
your arm.
To magnify the applied force.
Magnify or reduce the force which you apply.
The change of the direction of the pull.

25. Fractional mechanical advantage
Work=Force*Distance
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time

26. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

27. What direction does the effort and resistance move in third class levers.
Connects shafts having a 90 degree angle.
1
The force used to overcome friction is greater than the force used to do useful work.
Same.

28. What is the formula for the wheel and axle?
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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

29. Friction is involved when?
Work=Force*Distance
Can change the direction of motion.
Two surfaces move against one another.
Wheel and axle.

30. With a single fixed sheave what is the only mechanical advantage?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.
Shafts lying at any given angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

31. What is the jack screw used for?
To raise a house or other heavy machinery.
45
The rope that passes through your hands is greater than the distance that the load is raised.
Gravity - Magnetism - Friction - Recoil

32. Class two lever
2(pie)/pitch
fulcrum- weight- effort
In pounds.
2. Each half of the rope carries an equal amount of weight.

33. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
32/8 = 4

34. The worm gear is a combination of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.

35. What kind of machine is the inclined plane?
Shafts lying at any given angle.
Simple machine
Magnify or reduce the force which you apply.
Third class lever.

36. Work is measured in units also known as?
Foot- pounds
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
A screw and a spur gear.

37. How is distance measured in work?
Feet.
Connects shafts having a 90 degree angle.
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.

38. What is the power formula?
Less than 1.
Connects shafts having a 90 degree angle.
Power=Work/Time
Same.

39. What is the second thing a gear can do?
Less than 1.
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Opposite.

40. Gears can do a job for you by changing what three things?
Opposite.
32/8 = 4
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil

41. How is work done?
32/8 = 4
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
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 first thing a gear can do?
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.
Magnify or reduce the force which you apply.

43. What direction does the effort and resistance move in the second class levers?
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.
Same.

44. How do you measure power?
In Horsepower.
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.

45. What is the purpose of a third class lever?
2(pie)/pitch
The change of the direction of the pull.
To speed up the motion of resistence.
Same.

46. What is the ratio of any gear train?
Door knob.
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.
Power=Work/Time

47. What is the theoretical mechanical advantage of any gear train?
Positive mechanical advantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil

48. What is the mechanical advantage for a single fixed block?
A few thousandths of an inch.
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
1

49. hat is a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
To speed up the motion of resistence.
To raise a house or other heavy machinery.

50. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
Length of ramp/length of height from floor to truck