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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. Work is measured in units also known as?
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
Foot- pounds
Magnify or reduce the force which you apply.

2. How do you measure power?
Same.
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.
In Horsepower.

3. hat is a screw?
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.
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
Power=Work/Time

4. What type of lever provides a fractional mechanical advantage?
Third class lever.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
your arm.

5. What is the work formula?
Work=Force*Distance
2(pie)/pitch
Less than 1.
A few thousandths of an inch.

6. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
The change of the direction of the pull.
Same.
To magnify the applied force.

7. What are first and third class levers used for?
To magnify the applied force.
With oil - grease or soap.
fulcrum- weight- effort
Two surfaces move against one another.

8. How do you find the mechanical advantage?
Gravity - Magnetism - Friction - Recoil
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.
Shafts lying at any given angle.
To raise a house or other heavy machinery.

9. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Equals the weight of the object being hoisted.
The change of the direction of the pull.
Magnify or reduce the force which you apply.

10. What is the theoretical mechanical advantage of any gear train?
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.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort

11. Friction is involved when?
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
Magnify or reduce the force which you apply.

12. A miter gear connects what?
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.
Same.
To magnify the applied force.

13. What is one type of second class lever?
Gravity - Magnetism - Friction - Recoil
45
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

14. What is the second thing a gear can do?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
Third class lever.

15. What direction does the effort and resistance move in third class levers.
To raise a house or other heavy machinery.
Same.
Wheel and axle.
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

16. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Equals the weight of the object being hoisted.
Third class lever.
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.

17. What is the power formula?
32/8 = 4
Wheel and axle.
Work=Force*Distance
Power=Work/Time

18. The worm gear is a combination of what?
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.
A screw and a spur gear.
A few thousandths of an inch.

19. Gears can do a job for you by changing what three things?
Positive mechanical advantage.
Direction - speed or size of the force applied.
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.

20. What is the mechanical advantage for a single fixed block?
Same.
1
Work=Force*Distance
fulcrum- weight- effort

21. What is the first thing a gear can do?
Can change the direction of motion.
Power=Work/Time
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.

22. Formula for fractional mechanical disadvantage.
Length of ramp/length of height from floor to truck
Less than 1.
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

23. How can you figure out the mechanical advantage of most block and falls by glance?
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.
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.

24. What is another example of a wheel and axle?
Positive mechanical advantage.
Can change the direction of motion.
Third class lever.
Door knob.

25. What is the third thing a gear can do?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.

26. What is the purpose of a third class lever?
Same.
Equals the weight of the object being hoisted.
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

27. What is the jack screw used for?
To raise a house or other heavy machinery.
To magnify the applied force.
Length of ramp/length of height from floor to truck
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

28. What is the lever formula?
Door knob.
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.
2(pie)/pitch

29. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Third class lever.
Connects shafts having a 90 degree angle.
2(pie)/pitch

30. What kind of machine is the inclined plane?
2(pie)/pitch
Two surfaces move against one another.
Simple machine
Foot- pounds

31. What are the 4 forces?
Same.
Simple machine
Gravity - Magnetism - Friction - Recoil
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
Same.

33. How is distance measured in work?
Two surfaces move against one another.
Feet.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.

34. What is the mechanical advantage of a single movable block?
A modification of an inclined plane.
With oil - grease or soap.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.

35. 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?
32/8 = 4
Work=Force*Distance
Feet.
Foot- pounds

36. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
Wheel and axle.
A screw and a spur gear.

37. How is work done?
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
In pounds.

38. How is force measured in work?
In pounds.
Length of ramp/length of height from floor to truck
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.

39. How can you decrease friction on flat surfaces?
fulcrum- weight- effort
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
45

40. What is an example of a third class lever?
1
Positive mechanical advantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
your arm.

41. What direction does the effort and resistance move in the second class levers?
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.
Same.
Positive mechanical advantage.

42. An egg beater has a mechanical advantage of what?
Less than 1.
Simple machine
Positive mechanical advantage.
Opposite.

43. What does a micrometer measure?
Foot- pounds
1
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
A few thousandths of an inch.

44. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
With oil - grease or soap.
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 direction does the effort and resistance move in first class levers?
The change of the direction of the pull.
Direction - speed or size of the force applied.
Opposite.
Can change the direction of motion.

46. What is the formula for the wheel and axle?
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.
Feet.
In Horsepower.

47. The miter gear faces are beveled at what 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.
45
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.

48. Class two lever
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To speed up the motion of resistence.
fulcrum- weight- effort
Two surfaces move against one another.

49. What is the ratio of any gear train?
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time
Feet.

50. The bevel gear is used to connect what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.
Two surfaces move against one another.
In Horsepower.