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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 kind of machine is the inclined plane?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.
Simple machine
To speed up the motion of resistence.

2. What is another example of a wheel and axle?
A few thousandths of an inch.
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.
Door knob.

3. What are first and third class levers used for?
Shafts lying at any given angle.
Wheel and axle.
To magnify the applied force.
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. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.

5. Fractional mechanical advantage
1
A few thousandths of an inch.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.

6. How can you figure out the mechanical advantage of most block and falls by glance?
Equals the weight of the object being hoisted.
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time

7. How can you decrease friction on flat surfaces?
With oil - grease or soap.
your arm.
The change of the direction of the pull.
Third class lever.

8. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.

9. What direction does the effort and resistance move in first class levers?
Positive mechanical advantage.
Work=Force*Distance
32/8 = 4
Opposite.

10. What is another way to find the mechanical advantage of an inclined plane?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck
Opposite.
To speed up the motion of resistence.

11. What is the mechanical advantage for a single fixed block?
1
Work=Force*Distance
Same.
Shafts lying at any given angle.

12. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Direction - speed or size of the force applied.
Two surfaces move against one another.
Equals the weight of the object being hoisted.

13. The worm gear is a combination of what?
A screw and a spur gear.
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.
Gravity - Magnetism - Friction - Recoil

14. What is the theoretical mechanical advantage 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.
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

15. Work is measured in units also known as?
A few thousandths of an inch.
Door knob.
Third class lever.
Foot- pounds

16. What is the jack screw used for?
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
To raise a house or other heavy machinery.
To speed up the motion of resistence.

17. The threads of a screw are cut so?
Work=Force*Distance
your arm.
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.

18. How do you find the mechanical advantage?
To raise a house or other heavy machinery.
In pounds.
2. Each half of the rope carries an equal amount of weight.
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.

19. The bevel gear is used to connect what?
Simple machine
Shafts lying at any given angle.
Door knob.
Connects shafts having a 90 degree angle.

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

21. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.
Power=Work/Time

22. What is the work formula?
Door knob.
Work=Force*Distance
In Horsepower.
Same.

23. What is the first thing a gear can do?
Increase or decrease the the speed of the applied motion.
Work=Force*Distance
Can change the direction of motion.
To speed up the motion of resistence.

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

25. How is force measured in work?
When a resistance is overcome by a force acting through a measurable distance.
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.
In pounds.

26. The miter gear faces are beveled at what angle?
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.
Same.
45

27. What is the formula for the mechanical advantage of a screw?
your arm.
Wheel and axle.
A modification of an inclined plane.
2(pie)/pitch

28. What type of lever provides a fractional mechanical advantage?
To magnify the applied force.
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.

29. What kind of mechanical advantage does the first and second class lever provide?
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.
Positive mechanical advantage.
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 ratio of any gear train?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
fulcrum- weight- effort

31. What is the power formula?
Same.
In pounds.
Third class lever.
Power=Work/Time

32. Class two lever
fulcrum- weight- effort
Third class lever.
Same.
Increase or decrease the the speed of the applied motion.

33. What is the formula for the wheel and axle?
Simple machine
When a resistance is overcome by a force acting through a measurable distance.
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

34. What direction does the effort and resistance move in the second class levers?
2(pie)/pitch
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.
Same.

35. With a single fixed sheave what is the only mechanical advantage?
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.
Same.
The change of the direction of the pull.

36. What does a micrometer measure?
Door knob.
In pounds.
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

37. A miter gear connects what?
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.
Opposite.
Connects shafts having a 90 degree angle.

38. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

39. An egg beater has a mechanical advantage of what?
Less than 1.
45
Can change the direction of motion.
To raise a house or other heavy machinery.

40. What is the second thing a gear can do?
Connects shafts having a 90 degree angle.
32/8 = 4
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

41. How is distance 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
In Horsepower.
Count the number of parts of the rope going to and from the movable block.
Feet.

42. What is the lever formula?
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

43. 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 speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
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

44. What is the mechanical advantage of a single movable block?
Increase or decrease the the speed of the applied motion.
Door knob.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.

45. How do you measure power?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Connects shafts having a 90 degree angle.

46. What direction does the effort and resistance move in third class levers.
When a resistance is overcome by a force acting through a measurable distance.
45
Same.
Work=Force*Distance

47. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
2(pie)/pitch
Same.

48. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

49. What is the purpose of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
To speed up the motion of resistence.
Third class lever.

50. What is one type of second class lever?
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
2(pie)/pitch
Wheel and axle.