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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. How is work done?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Simple machine
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

2. What is the formula for the wheel and axle?
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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
Same.

3. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Opposite.
Positive mechanical advantage.
Connects shafts having a 90 degree angle.

4. 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.
Less than 1.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

5. The bevel gear is used to connect what?
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
Shafts lying at any given angle.

6. How do you measure power?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Foot- pounds

7. The worm gear is a combination of what?
Door knob.
Can change the direction of motion.
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.

8. 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?
Same.
Connects shafts having a 90 degree angle.
Opposite.
32/8 = 4

9. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
45
Can change the direction of motion.

10. What is an example of a third class lever?
fulcrum- weight- effort
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance

11. What type of lever provides a fractional mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
Third class lever.
Feet.

12. What is another example of a wheel and axle?
A few thousandths of an inch.
fulcrum- weight- effort
Can change the direction of motion.
Door knob.

13. What kind of mechanical advantage does the first and second class lever provide?
45
Positive mechanical advantage.
Wheel and axle.
Equals the weight of the object being hoisted.

14. What is the power formula?
In pounds.
32/8 = 4
A screw and a spur gear.
Power=Work/Time

15. What direction does the effort and resistance move in the second class levers?
Magnify or reduce the force which you apply.
Same.
Power=Work/Time
Positive mechanical advantage.

16. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
In Horsepower.
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Equals the weight of the object being hoisted.

17. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
Equals the weight of the object being hoisted.

18. What direction does the effort and resistance move in third class levers.
Count the number of parts of the rope going to and from the movable block.
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.
Same.

19. Gears can do a job for you by changing what three things?
Same.
Direction - speed or size of the force applied.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.

20. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Can change the direction of motion.
Same.
Third class lever.

21. What direction does the effort and resistance move in first class levers?
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
Third class lever.
Opposite.

22. A miter gear connects what?
To speed up the motion of resistence.
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
Connects shafts having a 90 degree angle.
your arm.

23. How can you figure out the mechanical advantage of most block and falls by glance?
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
A few thousandths of an inch.

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

25. The miter gear faces are beveled at what angle?
Shafts lying at any given angle.
45
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.

26. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Same.
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.

27. 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.
Foot- pounds
The change of the direction of the pull.
To magnify the applied force.

28. Class two lever
Work=Force*Distance
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
The force used to overcome friction is greater than the force used to do useful work.

29. What is the purpose of a third class lever?
To speed up the motion of resistence.
your arm.
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
Increase or decrease the the speed of the applied motion.

30. What does a micrometer measure?
A few thousandths of an inch.
Third class lever.
Power=Work/Time
45

31. The threads of a screw are cut so?
Same.
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
Work=Force*Distance

32. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

33. What are the 4 forces?
Door knob.
To magnify the applied force.
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.

34. How is distance measured in work?
2. Each half of the rope carries an equal amount of weight.
45
Feet.
Equals the weight of the object being hoisted.

35. What is the mechanical advantage for a single fixed block?
In Horsepower.
1
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

36. Friction is involved when?
Power=Work/Time
Work=Force*Distance
In pounds.
Two surfaces move against one another.

37. hat is a screw?
The rope that passes through your hands is greater than the distance that the load is raised.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Two surfaces move against one another.

38. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The change of the direction of the pull.
Third class lever.
Two surfaces move against one another.

39. An egg beater has a mechanical advantage of what?
Less than 1.
Work=Force*Distance
The change of the direction of the pull.
In Horsepower.

40. What is the jack screw used for?
A modification of an inclined plane.
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
45

41. How is force measured in work?
Simple machine
Can change the direction of motion.
In pounds.
Door knob.

42. Fractional mechanical advantage
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.

43. Formula for fractional mechanical disadvantage.
Length of ramp/length of height from floor to truck
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.
Opposite.

44. What is one type of second class lever?
Two surfaces move against one another.
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Wheel and axle.

45. How do you find the mechanical advantage?
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.
your arm.
Shafts lying at any given angle.

46. What is the lever formula?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.

47. What are first and third class levers used for?
To magnify the applied force.
The change of the direction of the pull.
Positive mechanical advantage.
Feet.

48. What kind of machine is the inclined plane?
Shafts lying at any given angle.
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
Third class lever.

49. What is the work formula?
With oil - grease or soap.
Shafts lying at any given angle.
Work=Force*Distance
To speed up the motion of resistence.

50. Work is measured in units also known as?
Simple machine
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds
To speed up the motion of resistence.