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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. The worm gear is a combination of what?
A screw and a spur gear.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.

2. What is the formula for the mechanical advantage of a screw?
Door knob.
2(pie)/pitch
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.

3. An egg beater has a mechanical advantage of what?
The force used to overcome friction is greater than the force used to do useful work.
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.
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

4. How is work done?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
Opposite.
When a resistance is overcome by a force acting through a measurable distance.

5. 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?
32/8 = 4
1
Connects shafts having a 90 degree angle.
Positive mechanical advantage.

6. What is another way to find the mechanical advantage of an inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
Positive mechanical advantage.
Can change the direction of motion.

7. Formula for fractional mechanical disadvantage.
Foot- pounds
Door knob.
Equals the weight of the object being hoisted.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

8. Fractional mechanical advantage
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
Magnify or reduce the force which you apply.

9. What are the 4 forces?
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.
1
Gravity - Magnetism - Friction - Recoil

10. What is the work formula?
With oil - grease or soap.
Positive mechanical advantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance

11. How is force measured in work?
32/8 = 4
Positive mechanical advantage.
Foot- pounds
In pounds.

12. What is another example of a wheel and axle?
Count the number of parts of the rope going to and from the movable block.
Door knob.
Less than 1.
To speed up the motion of resistence.

13. What is the power formula?
A screw and a spur gear.
Power=Work/Time
In Horsepower.
Same.

14. What is the purpose of a third class lever?
Two surfaces move against one another.
To speed up the motion of resistence.
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.

15. What is the mechanical advantage for a single fixed block?
Feet.
In Horsepower.
1
Equals the weight of the object being hoisted.

16. 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.
Positive mechanical advantage.
Foot- pounds

17. What kind of machine is the inclined plane?
To magnify the applied force.
Shafts lying at any given angle.
your arm.
Simple machine

18. The miter gear faces are beveled at what angle?
Direction - speed or size of the force applied.
your arm.
45
2(pie)/pitch

19. What is the second thing a gear can do?
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
Power=Work/Time
Wheel and axle.

20. Work is measured in units also known as?
Foot- pounds
Gravity - Magnetism - Friction - Recoil
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.

21. What are first and third class levers used for?
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
To raise a house or other heavy machinery.

22. Gears can do a job for you by changing what three things?
your arm.
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.

23. A miter gear connects what?
your arm.
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.
Connects shafts having a 90 degree angle.

24. What does a micrometer measure?
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.
A few thousandths of an inch.

25. What direction does the effort and resistance move in first class levers?
In Horsepower.
Opposite.
Shafts lying at any given angle.
To magnify the applied force.

26. What direction does the effort and resistance move in third class levers.
Same.
A screw and a spur gear.
To magnify the applied force.
Less than 1.

27. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
A few thousandths of an inch.

28. Class two lever
Length of ramp/length of height from floor to truck
your arm.
fulcrum- weight- effort
32/8 = 4

29. What type of lever provides a fractional mechanical advantage?
Third class lever.
Count the number of parts of the rope going to and from the movable block.
Increase or decrease the the speed of the applied motion.
In pounds.

30. What is the theoretical mechanical advantage of any gear train?
your arm.
In Horsepower.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Work=Force*Distance

31. What is the jack screw used for?
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
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.

32. What kind of mechanical advantage does the first and second class lever provide?
In pounds.
Shafts lying at any given angle.
A few thousandths of an inch.
Positive mechanical advantage.

33. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
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
Magnify or reduce the force which you apply.

34. What is an example of a third class lever?
your arm.
Direction - speed or size of the force applied.
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.

35. How do you measure power?
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
In Horsepower.

36. 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.
The force used to overcome friction is greater than the force used to do useful work.
Same.
Connects shafts having a 90 degree angle.

37. How do you find the 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.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck

38. What is the mechanical advantage of a single movable block?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
Foot- pounds

39. 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
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.

40. Friction is involved when?
your arm.
Two surfaces move against one another.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.

41. What is one type of second class lever?
Third class lever.
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.
Opposite.
Wheel and axle.

42. What is the ratio of any gear train?
Magnify or reduce the force which you apply.
2(pie)/pitch
Third class lever.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

43. What direction does the effort and resistance move in the second class levers?
Equals the weight of the object being hoisted.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
Foot- pounds

44. How is distance measured in work?
Magnify or reduce the force which you apply.
A screw and a spur gear.
Feet.
Gravity - Magnetism - Friction - Recoil

45. What is the third thing a gear can do?
A modification of an inclined plane.
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
Third class lever.

46. How can you decrease friction on flat surfaces?
Connects shafts having a 90 degree angle.
32/8 = 4
Can change the direction of motion.
With oil - grease or soap.

47. hat is a screw?
In Horsepower.
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

48. How can you figure out the mechanical advantage of most block and falls by glance?
32/8 = 4
Opposite.
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

49. What is the first thing a gear can do?
Can change the direction of motion.
Connects shafts having a 90 degree 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.
To raise a house or other heavy machinery.

50. The bevel gear is used to connect what?
Shafts lying at any given angle.
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
Opposite.