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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. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.
A screw and a spur gear.
Third class lever.

2. hat is a screw?
A modification of an inclined plane.
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
1

3. A miter gear connects what?
Power=Work/Time
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance

4. Gears can do a job for you by changing what three things?
2(pie)/pitch
A screw and a spur gear.
Direction - speed or size of the force applied.
In Horsepower.

5. How is work done?
Same.
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
Same.

6. 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.
Same.
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

7. The bevel gear is used to connect what?
The change of the direction of the pull.
Shafts lying at any given angle.
A modification of an inclined plane.
Equals the weight of the object being hoisted.

8. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.
Door knob.
Same.

9. What kind of mechanical advantage does the first and second class lever provide?
your arm.
Positive mechanical advantage.
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.
32/8 = 4

10. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Foot- pounds
Opposite.
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

11. The worm gear is a combination of what?
Same.
In pounds.
your arm.
A screw and a spur gear.

12. What is the purpose of a third class lever?
2(pie)/pitch
Magnify or reduce the force which you apply.
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.

13. 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.
Power=Work/Time
Two surfaces move against one another.
In pounds.

14. What is the mechanical advantage for a single fixed block?
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.

15. What does a micrometer measure?
2(pie)/pitch
A few thousandths of an inch.
The change of the direction of the pull.
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.

16. Formula for fractional mechanical disadvantage.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
A modification of an inclined plane.

17. 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?
A screw and a spur gear.
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.
Increase or decrease the the speed of the applied motion.

18. What is the formula for the wheel and axle?
To raise a house or other heavy machinery.
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
Direction - speed or size of the force applied.
Positive mechanical advantage.

19. What is the power formula?
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time
In Horsepower.

20. What is one type of second class lever?
With oil - grease or soap.
Connects shafts having a 90 degree angle.
your arm.
Wheel and axle.

21. How can you figure out the mechanical advantage of most block and falls by glance?
1
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.

22. Work is measured in units also known as?
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.
Foot- pounds

23. How do you find the mechanical advantage?
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.
Simple machine
Same.

24. The threads of a screw are cut so?
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.
Same.
Opposite.

25. What is the mechanical advantage of a single movable block?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.

26. How is distance measured in work?
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

27. An egg beater has a mechanical advantage of what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
In pounds.

28. What is the work formula?
1
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.
A screw and a spur gear.

29. The miter gear faces are beveled at what angle?
2. Each half of the rope carries an equal amount of weight.
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
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.
45

30. Class two lever
Foot- pounds
A few thousandths of an inch.
fulcrum- weight- effort
1

31. What is an example of a third class lever?
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck
your arm.
Opposite.

32. 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.
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck
Feet.

33. What is the first thing a gear can do?
Can change the direction of motion.
A modification of an inclined plane.
In pounds.
2(pie)/pitch

34. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
Less than 1.
Same.

35. Friction is involved when?
Shafts lying at any given angle.
A few thousandths of an inch.
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
Two surfaces move against one another.

36. What is the jack screw used for?
To raise a house or other heavy machinery.
fulcrum- weight- effort
Foot- pounds
1

37. How can you decrease friction on flat surfaces?
To speed up the motion of resistence.
With oil - grease or soap.
Equals the weight of the object being hoisted.
The change of the direction of the pull.

38. How is force measured in work?
In pounds.
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
Opposite.

39. What kind of machine is the inclined plane?
Simple machine
A screw and a spur gear.
The change of the direction of the pull.
To speed up the motion of resistence.

40. What is the second thing a gear can do?
Work=Force*Distance
Less than 1.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

41. With a single fixed sheave what is the only mechanical advantage?
Third class lever.
The change of the direction of the pull.
Equals the weight of the object being hoisted.
fulcrum- weight- effort

42. What is the formula for the mechanical advantage of a screw?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
Two surfaces move against one another.

43. What direction does the effort and resistance move in third class levers.
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
Same.

44. How do you measure power?
Third class lever.
To speed up the motion of resistence.
Direction - speed or size of the force applied.
In Horsepower.

45. What is the third thing a gear can do?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
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
45

46. What type of lever provides a fractional mechanical advantage?
Third class lever.
To speed up the motion of resistence.
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.

47. What are first and third class levers used for?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
32/8 = 4
2(pie)/pitch

48. What is another example of a wheel and axle?
Door knob.
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

49. What are the 4 forces?
45
Same.
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch

50. What is another way to find the mechanical advantage of an inclined plane?
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil