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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 is the formula for the wheel and axle?
Less than 1.
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
Two surfaces move against one another.

2. Work is measured in units also known as?
A screw and a spur gear.
To raise a house or other heavy machinery.
Foot- pounds
Shafts lying at any given angle.

3. How is work done?
Equals the weight of the object being hoisted.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

4. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

5. What is the purpose of a 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.
Equals the weight of the object being hoisted.
To magnify the applied force.

6. How can you decrease friction on flat surfaces?
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.
In Horsepower.
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.

7. 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.
Feet.

8. What is the first thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch
Power=Work/Time
Can change the direction of motion.

9. Class two lever
To magnify the applied force.
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil
fulcrum- weight- effort

10. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
2(pie)/pitch
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.
The rope that passes through your hands is greater than the distance that the load is raised.

11. What is another example of a wheel and axle?
32/8 = 4
To magnify the applied force.
Door knob.
Equals the weight of the object being hoisted.

12. hat is a screw?
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.
Shafts lying at any given angle.
A modification of an inclined plane.

13. The miter gear faces are beveled at what angle?
45
Gravity - Magnetism - Friction - Recoil
1
Power=Work/Time

14. What direction does the effort and resistance move in third class levers.
To raise a house or other heavy machinery.
Third class lever.
Count the number of parts of the rope going to and from the movable block.
Same.

15. How is force measured in work?
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
Shafts lying at any given angle.

16. What is the power formula?
Less than 1.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.

17. 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.
Shafts lying at any given angle.
Two surfaces move against one another.
Less than 1.

18. A miter gear connects what?
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
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.

19. What are first and third class levers used for?
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
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.

20. An egg beater has a mechanical advantage of what?
Door knob.
Direction - speed or size of the force applied.
Feet.
Less than 1.

21. What is the second thing a gear can do?
1
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
In Horsepower.

22. How can you figure out the mechanical advantage of most block and falls by glance?
Simple machine
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.

23. Gears can do a job for you by changing what three things?
Same.
With oil - grease or soap.
Direction - speed or size of the force applied.
Work=Force*Distance

24. What is the lever formula?
When a resistance is overcome by a force acting through a measurable distance.
A modification 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.
Count the number of parts of the rope going to and from the movable block.

25. How do you find the mechanical advantage?
Same.
Foot- pounds
Opposite.
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.

26. What type of lever provides a fractional mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The change of the direction of the pull.
Magnify or reduce the force which you apply.
Third class lever.

27. What kind of machine is the inclined plane?
Simple machine
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.

28. What is the mechanical advantage for a single fixed block?
Work=Force*Distance
1
Feet.
Third class lever.

29. What is the work formula?
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance
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.

30. What is one type of second class lever?
Wheel and axle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.
Count the number of parts of the rope going to and from the movable block.

31. What is an example of a third class lever?
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Wheel and axle.
Shafts lying at any given angle.

32. 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.
Equals the weight of the object being hoisted.
Power=Work/Time
A few thousandths of an inch.

33. The threads of a screw are cut so?
Gravity - Magnetism - Friction - Recoil
1
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

34. The worm gear is a combination of what?
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
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.

35. With a single fixed sheave what is the only mechanical advantage?
To magnify the applied force.
The change of the direction of the pull.
Foot- pounds
To raise a house or other heavy machinery.

36. What direction does the effort and resistance move in the second class levers?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.
Same.
Can change the direction of motion.

37. Friction is involved when?
your arm.
Shafts lying at any given angle.
Same.
Two surfaces move against one another.

38. 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?
Power=Work/Time
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.

39. What direction does the effort and resistance move in first class levers?
To raise a house or other heavy machinery.
Can change the direction of motion.
Opposite.
your arm.

40. What is the third thing a gear can do?
A modification of an inclined plane.
Same.
Positive mechanical advantage.
Magnify or reduce the force which you apply.

41. What are the 4 forces?
To speed up the motion of resistence.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
fulcrum- weight- effort

42. How is distance measured in work?
Feet.
Length of ramp/length of height from floor to truck
Foot- pounds
Connects shafts having a 90 degree angle.

43. What does a micrometer measure?
Positive mechanical advantage.
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
A few thousandths of an inch.

44. Fractional 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
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

45. What is another way to find the mechanical advantage of an inclined plane?
2(pie)/pitch
Wheel and axle.
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck

46. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
45
Feet.
Same.

47. 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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Third class lever.
Equals the weight of the object being hoisted.
Two surfaces move against one another.

48. What is the jack screw used for?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.
Same.

49. The bevel gear is used to connect what?
Magnify or reduce the force which you apply.
Two surfaces move against one another.
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.

50. How do you measure power?
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
Shafts lying at any given angle.