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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. What are the 4 forces?
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
Same.

2. Friction is involved when?
Feet.
A few thousandths of an inch.
Two surfaces move against one another.
1

3. What is the formula for the mechanical advantage of a screw?
To raise a house or other heavy machinery.
2(pie)/pitch
Less than 1.
Length of ramp/length of height from floor to truck

4. With a single fixed sheave what is the only mechanical advantage?
Direction - speed or size of the force applied.
Less than 1.
A few thousandths of an inch.
The change of the direction of the pull.

5. The worm gear is a combination of what?
A screw and a spur gear.
To raise a house or other heavy machinery.
Same.
Connects shafts having a 90 degree angle.

6. What is the power formula?
1
2(pie)/pitch
Less than 1.
Power=Work/Time

7. What is the first thing a gear can do?
In pounds.
Magnify or reduce the force which you apply.
Can change the direction of motion.
To magnify the applied force.

8. The miter gear faces are beveled at what angle?
To speed up the motion of resistence.
45
32/8 = 4
Door knob.

9. What is another example of a wheel and axle?
1
A few thousandths of an inch.
Door knob.
In pounds.

10. What is another way to find the mechanical advantage of an inclined plane?
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
With oil - grease or soap.
In Horsepower.

11. What is the work formula?
45
Less than 1.
A modification of an inclined plane.
Work=Force*Distance

12. What is one type of second class lever?
To speed up the motion of resistence.
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
Door knob.

13. What is the purpose of a third class lever?
Less than 1.
Two surfaces move against one another.
32/8 = 4
To speed up the motion of resistence.

14. How is distance measured in work?
Magnify or reduce the force which you apply.
Same.
Feet.
Direction - speed or size of the force applied.

15. An egg beater has a mechanical advantage of what?
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
Two surfaces move against one another.

16. A miter gear connects what?
2(pie)/pitch
In pounds.
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.

17. Fractional mechanical advantage
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

18. What is the mechanical advantage for a single fixed block?
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
Gravity - Magnetism - Friction - Recoil
1

19. How do you find the mechanical advantage?
Wheel and axle.
The change of the direction of the pull.
2(pie)/pitch
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.

20. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
Equals the weight of the object being hoisted.
Opposite.

21. What direction does the effort and resistance move in the second class levers?
Foot- pounds
Two surfaces move against one another.
Same.
Third class lever.

22. How do you measure power?
Increase or decrease the the speed of the applied motion.
In Horsepower.
Connects shafts having a 90 degree angle.
Wheel and axle.

23. The bevel gear is used to connect what?
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.
1
Shafts lying at any given angle.

24. What kind of machine is the inclined plane?
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.
In pounds.

25. What is the mechanical advantage of a single movable block?
Less than 1.
The change of the direction of the pull.
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.

26. How can you figure out the mechanical advantage of most block and falls by glance?
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
Same.

27. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
Door knob.
Count the number of parts of the rope going to and from the movable block.

28. Formula for fractional mechanical disadvantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1

29. What is the ratio of any gear train?
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.

30. What is the formula for the wheel and axle?
To speed up the motion of resistence.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A modification of an inclined plane.
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

31. hat is a screw?
A modification of an inclined plane.
Positive mechanical advantage.
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(pie)/pitch

32. What kind of mechanical advantage does the first and second class lever provide?
Door knob.
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
Same.

33. What is the second thing a gear can do?
In pounds.
Increase or decrease the the speed of the applied motion.
Feet.
To speed up the motion of resistence.

34. What direction does the effort and resistance move in third class levers.
Same.
your arm.
32/8 = 4
2. Each half of the rope carries an equal amount of weight.

35. What is the jack screw used for?
Less than 1.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.

36. 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?
Work=Force*Distance
Positive mechanical advantage.
fulcrum- weight- effort
32/8 = 4

37. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Simple machine

38. Class two lever
To magnify the applied force.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.

39. What type of lever provides a fractional mechanical advantage?
Magnify or reduce the force which you apply.
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.
Third class lever.

40. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Same.

41. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Wheel and axle.
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.

42. What is the lever formula?
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Work=Force*Distance

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

44. How can you decrease friction on flat surfaces?
Equals the weight of the object being hoisted.
In pounds.
A few thousandths of an inch.
With oil - grease or soap.

45. Work is measured in units also known as?
Power=Work/Time
Foot- pounds
A few thousandths of an inch.
Equals the weight of the object being hoisted.

46. What direction does the effort and resistance move in first class levers?
Opposite.
Third class lever.
To speed up the motion of resistence.
Feet.

47. What is an example of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
45
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.
your arm.

48. How is force measured in work?
Third class lever.
Simple machine
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 pounds.

49. What is the theoretical mechanical advantage of any gear train?
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Opposite.
The change of the direction of the pull.

50. What are first and third class levers used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
To magnify the applied force.
1