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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. Gears can do a job for you by changing what three things?
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.

2. What are the 4 forces?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Gravity - Magnetism - Friction - Recoil
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 direction does the effort and resistance move in first class levers?
Count the number of parts of the rope going to and from the movable block.
Opposite.
In pounds.
Two surfaces move against one another.

4. Friction is involved when?
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.
1
Two surfaces move against one another.

5. How is distance measured in work?
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil
32/8 = 4
Feet.

6. The miter gear faces are beveled at what angle?
45
Connects shafts having a 90 degree angle.
In Horsepower.
2. Each half of the rope carries an equal amount of weight.

7. 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?
To magnify the applied force.
In Horsepower.
32/8 = 4
2(pie)/pitch

8. What is the first thing a gear can do?
2(pie)/pitch
Connects shafts having a 90 degree angle.
Can change the direction of motion.
fulcrum- weight- effort

9. What are first and third class levers used for?
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.

10. What is the jack screw used for?
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.
fulcrum- weight- effort
To raise a house or other heavy machinery.

11. The bevel gear is used to connect what?
Shafts lying at any given angle.
Third class lever.
2(pie)/pitch
A few thousandths of an inch.

12. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
your arm.
2(pie)/pitch

13. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.
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
Door knob.

14. The worm gear is a combination of what?
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.
A screw and a spur gear.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

15. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

16. What is an example of a third class lever?
Direction - speed or size of the force applied.
Third class lever.
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

17. What is the ratio of any gear train?
Same.
A modification of an inclined plane.
To speed up the motion of resistence.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

18. Fractional mechanical advantage
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.

19. What is the power formula?
Same.
Power=Work/Time
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.
Door knob.

20. What type of lever provides a fractional mechanical advantage?
In 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.
Connects shafts having a 90 degree angle.
Third class lever.

21. Work is measured in units also known as?
Foot- pounds
In pounds.
In Horsepower.
your arm.

22. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

23. What kind of mechanical advantage does the first and second class lever provide?
Two surfaces move against one another.
Positive mechanical advantage.
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.

24. What does a micrometer measure?
Equals the weight of the object being hoisted.
A few thousandths of an inch.
2(pie)/pitch
Work=Force*Distance

25. Formula for fractional mechanical disadvantage.
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
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

26. How do you find the mechanical advantage?
To raise a house or other heavy machinery.
To speed up the motion of resistence.
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.

27. How do you measure power?
1
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.

28. 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.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.
Opposite.

29. What is the formula for the 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.
The change of the direction of the pull.
Two surfaces move against one another.
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. What is the lever formula?
Door knob.
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Opposite.

31. What is the second thing a gear can do?
Power=Work/Time
Can change the direction of motion.
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

32. What is the theoretical mechanical advantage of any gear train?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third 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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

33. What is the work formula?
Count the number of parts of the rope going to and from the movable block.
32/8 = 4
Work=Force*Distance
Power=Work/Time

34. What direction does the effort and resistance move in the second class levers?
With oil - grease or soap.
Third class lever.
Same.
Connects shafts having a 90 degree angle.

35. What is another example of a wheel and axle?
Door knob.
Less than 1.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.

36. An egg beater has a mechanical advantage of what?
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Less than 1.

37. A miter gear connects what?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
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.

38. Class two lever
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.
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

39. hat is a screw?
Shafts lying at any given angle.
A modification of an inclined plane.
Foot- pounds
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.

40. What is the mechanical advantage of a single movable block?
Feet.
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time
To raise a house or other heavy machinery.

41. What is the mechanical advantage for a single fixed block?
To raise a house or other heavy machinery.
Feet.
1
32/8 = 4

42. With a single fixed sheave what is the only mechanical advantage?
Length of ramp/length of height from floor to truck
Door knob.
The change of the direction of the pull.
Power=Work/Time

43. What kind of machine is the inclined plane?
Simple machine
The change of the direction of the pull.
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.

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
Third class lever.
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.

45. What is another way to find the mechanical advantage of an inclined plane?
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
Power=Work/Time

46. How is work done?
Same.
Foot- pounds
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.

47. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.

48. What is one type of second class lever?
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.
Positive mechanical advantage.

49. How can you decrease friction on flat surfaces?
your arm.
With oil - grease or soap.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.

50. What direction does the effort and resistance move in third class levers.
In Horsepower.
Third class lever.
2. Each half of the rope carries an equal amount of weight.
Same.