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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.

2. What is the first thing a gear can do?
Feet.
In Horsepower.
Can change the direction of motion.
Wheel and axle.

3. The bevel gear is used to connect what?
Feet.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
To magnify the applied force.

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

5. How is distance measured in work?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Feet.

6. 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?
45
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
32/8 = 4

7. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Can change the direction of motion.
To raise a house or other heavy machinery.
Foot- pounds
Equals the weight of the object being hoisted.

8. The worm gear is a combination of what?
A screw and a spur gear.
Length of ramp/length of height from floor to truck
In Horsepower.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

9. An egg beater has a mechanical advantage of what?
Two surfaces move against one another.
In Horsepower.
Less than 1.
The change of the direction of the pull.

10. How is force measured in work?
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.
In pounds.
Door knob.

11. What is the second thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Less than 1.
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.

12. 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.
Opposite.
fulcrum- weight- effort
Magnify or reduce the force which you apply.

13. What is another example of a wheel and axle?
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
Door knob.
Opposite.

14. The miter gear faces are beveled at what angle?
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.

15. What does a micrometer measure?
2(pie)/pitch
In Horsepower.
A few thousandths of an inch.
Foot- pounds

16. What is the mechanical advantage for a single fixed block?
1
fulcrum- weight- effort
In pounds.
Opposite.

17. The threads of a screw are cut so?
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
The force used to overcome friction is greater than the force used to do useful work.
1

18. What kind of mechanical advantage does the first and second class lever provide?
45
Less than 1.
fulcrum- weight- effort
Positive mechanical advantage.

19. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
A screw and a spur gear.
Wheel and axle.
Less than 1.

20. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.
Door knob.
2. Each half of the rope carries an equal amount of weight.

21. What is the power formula?
Two surfaces move against one another.
Third class lever.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

22. Class two lever
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Simple machine
fulcrum- weight- effort

23. 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.
Direction - speed or size of the force applied.
Shafts lying at any given angle.
32/8 = 4

24. A miter gear connects what?
1
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.

25. What is an example of a third class lever?
To speed up the motion of resistence.
your arm.
45
Foot- pounds

26. How can you decrease friction on flat surfaces?
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 raise a house or other heavy machinery.
In Horsepower.
With oil - grease or soap.

27. What direction does the effort and resistance move in third class levers.
Same.
2(pie)/pitch
Direction - speed or size of the force applied.
Shafts lying at any given angle.

28. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Wheel and axle.
fulcrum- weight- effort
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.

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

30. What is the purpose of a third class lever?
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.
your arm.

31. What is the formula for the mechanical advantage of a screw?
A modification of an inclined plane.
2(pie)/pitch
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.

32. How can you figure out the mechanical advantage of most block and falls by glance?
Shafts lying at any given angle.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
Third class lever.

33. What are first and third class levers used for?
Simple machine
Work=Force*Distance
Same.
To magnify the applied force.

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

35. What is one type of second class lever?
Work=Force*Distance
Equals the weight of the object being hoisted.
Wheel and axle.
Connects shafts having a 90 degree angle.

36. What is the work formula?
Work=Force*Distance
Can change the direction of motion.
Foot- pounds
Same.

37. What kind of machine is the inclined plane?
45
Same.
Increase or decrease the the speed of the applied motion.
Simple machine

38. How do you find the mechanical advantage?
A few thousandths of an inch.
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 rope that passes through your hands is greater than the distance that the load is raised.
your arm.

39. What is the ratio of any gear train?
Two surfaces move against one another.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.

40. What is the formula for the wheel and axle?
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
2(pie)/pitch
Opposite.

41. What direction does the effort and resistance move in first class levers?
fulcrum- weight- effort
1
Opposite.
Can change the direction of motion.

42. What is another way to find the mechanical advantage of an inclined plane?
Third class lever.
Door knob.
Can change the direction of motion.
Length of ramp/length of height from floor to truck

43. Friction is involved when?
A modification of an inclined plane.
Can change the direction of motion.
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

44. How do you measure power?
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.
Opposite.
In Horsepower.

45. What is the jack screw used for?
Direction - speed or size of the force applied.
Wheel and axle.
Simple machine
To raise a house or other heavy machinery.

46. What type of lever provides a fractional mechanical advantage?
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
The change of the direction of the pull.

47. With a single fixed sheave what is the only mechanical advantage?
A few thousandths of an inch.
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

48. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.
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

49. What are the 4 forces?
Same.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
Work=Force*Distance

50. hat is a screw?
To raise a house or other heavy machinery.
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.