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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 direction does the effort and resistance move in the second class levers?
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
Same.
2(pie)/pitch

2. How is distance measured in work?
Increase or decrease the the speed of the applied motion.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
45

3. The bevel gear is used to connect what?
Direction - speed or size of the force applied.
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.

4. Work is measured in units also known as?
1
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds

5. What direction does the effort and resistance move in third class levers.
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
Wheel and axle.

6. An egg beater has a mechanical advantage of what?
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
Third class lever.
Less than 1.

7. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.

8. The worm gear is a combination of what?
A screw and a spur gear.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Less than 1.

9. hat is a screw?
A modification of an inclined plane.
To raise a house or other heavy machinery.
Shafts lying at any given angle.
Can change the direction of motion.

10. What is the third thing a gear can do?
A screw and a spur gear.
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
32/8 = 4

11. What are first and third class levers used for?
Equals the weight of the object being hoisted.
2(pie)/pitch
To magnify the applied force.
Direction - speed or size of the force applied.

12. What is the ratio of any gear train?
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.
To raise a house or other heavy machinery.
Positive mechanical advantage.

13. The threads of a screw are cut so?
Connects shafts having a 90 degree angle.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.

14. What is one type of second class lever?
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
Equals the weight of the object being hoisted.
The change of the direction of the pull.

15. What type of lever provides a fractional mechanical advantage?
your arm.
To speed up the motion of resistence.
32/8 = 4
Third class lever.

16. What is another way to find the mechanical advantage of an inclined plane?
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.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck

17. What is the work formula?
Work=Force*Distance
With oil - grease or soap.
1
fulcrum- weight- effort

18. How is work done?
In Horsepower.
Same.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.

19. What is an example of a third class lever?
Wheel and axle.
your arm.
Work=Force*Distance
In pounds.

20. What is another example of a wheel and axle?
Door knob.
A few thousandths of an inch.
A modification of an inclined plane.
To speed up the motion of resistence.

21. What is the theoretical mechanical advantage of any gear train?
Direction - speed or size of the force applied.
In pounds.
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.

22. The miter gear faces are beveled at what angle?
45
Direction - speed or size of the force applied.
Can change the direction of motion.
1

23. How do you measure power?
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.
Simple machine

24. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
In pounds.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.

25. How is force measured in work?
In pounds.
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.

26. What are the 4 forces?
1
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.
With oil - grease or soap.

27. What is the second thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Increase or decrease the the speed of the applied motion.

28. How do you find the 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
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.
Wheel and axle.
32/8 = 4

29. Class two lever
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.

30. What is the formula for the wheel and axle?
Door knob.
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
Gravity - Magnetism - Friction - Recoil

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

32. What is the formula for the mechanical advantage of a screw?
Less than 1.
2(pie)/pitch
fulcrum- weight- effort
Equals the weight of the object being hoisted.

33. Gears can do a job for you by changing what three things?
Opposite.
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
The change of the direction of the pull.

34. 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
A modification of an inclined plane.
Shafts lying at any given angle.
Magnify or reduce the force which you apply.

35. What kind of mechanical advantage does the first and second class lever provide?
Opposite.
Positive mechanical advantage.
Can change the direction of motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

36. What is the mechanical advantage for a single fixed block?
Same.
1
2. Each half of the rope carries an equal amount of weight.
Door knob.

37. What is the power formula?
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1
Connects shafts having a 90 degree angle.

38. What direction does the effort and resistance move in first class levers?
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
Opposite.
The force used to overcome friction is greater than the force used to do useful work.

39. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil
1

40. What is the jack screw used for?
Opposite.
To raise a house or other heavy machinery.
A few thousandths of an inch.
To speed up the motion of resistence.

41. How can you figure out the mechanical advantage of most block and falls by glance?
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Increase or decrease the the speed of the applied motion.

42. What is the mechanical advantage of a single movable block?
With oil - grease or soap.
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.

43. What is the purpose of a third class lever?
Magnify or reduce the force which you apply.
Foot- pounds
To speed up the motion of resistence.
Can change the direction of motion.

44. Friction is involved when?
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.
With oil - grease or soap.
Same.

45. Formula for fractional mechanical disadvantage.
The force used to overcome friction is greater than the force used to do useful work.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
Wheel and axle.

46. What does a micrometer measure?
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.
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.

47. What is the lever formula?
Gravity - Magnetism - Friction - Recoil
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds

48. A miter gear connects what?
Connects shafts having a 90 degree angle.
Same.
Foot- pounds
Gravity - Magnetism - Friction - Recoil

49. Fractional mechanical advantage
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.

50. What is the first thing a gear can do?
A screw and a spur gear.
To raise a house or other heavy machinery.
Can change the direction of motion.
Direction - speed or size of the force applied.