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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. Formula for fractional mechanical disadvantage.
45
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.

2. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
Gravity - Magnetism - Friction - Recoil

3. What is the ratio of any gear train?
A screw and a spur gear.
fulcrum- weight- effort
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

4. 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?
45
A modification of an inclined plane.
Third class lever.
32/8 = 4

5. How can you figure out the mechanical advantage of most block and falls by glance?
Door knob.
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
45

6. How do you find the mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
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 the driven gears/ divided by the product of the number of teeth on the driver gears.

7. What is the power formula?
Work=Force*Distance
Connects shafts having a 90 degree angle.
1
Power=Work/Time

8. The miter gear faces are beveled at what angle?
Opposite.
Gravity - Magnetism - Friction - Recoil
45
A screw and a spur gear.

9. What is the first thing a gear can do?
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 pounds.
Connects shafts having a 90 degree angle.
Can change the direction of motion.

10. 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.
Opposite.
Same.
With oil - grease or soap.

11. What direction does the effort and resistance move in third class levers.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
Opposite.

12. What is another example of a wheel and axle?
Door knob.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil

13. How is force measured in work?
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
Foot- pounds
In pounds.

14. What kind of machine is the inclined plane?
Simple machine
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.

15. Fractional mechanical advantage
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.
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.

16. How is distance measured in work?
Third class lever.
fulcrum- weight- effort
Magnify or reduce the force which you apply.
Feet.

17. An egg beater has a mechanical advantage of what?
your arm.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.

18. What is the mechanical advantage for a single fixed block?
Door knob.
Length of ramp/length of height from floor to truck
32/8 = 4
1

19. Gears can do a job for you by changing what three things?
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.
Same.
To speed up the motion of resistence.

20. What is the formula for the wheel and axle?
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
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.
A few thousandths of an inch.

21. What are the 4 forces?
In pounds.
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil

22. How do you measure power?
Same.
Increase or decrease the the speed of the applied motion.
In Horsepower.
Opposite.

23. What are first and third class levers used for?
To magnify the applied force.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Two surfaces move against one another.

24. What is the work formula?
Shafts lying at any given angle.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance

25. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Same.
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.

26. What kind of mechanical advantage does the first and second class lever provide?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
Positive mechanical advantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

27. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
To magnify the applied force.

28. How is work done?
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

29. The worm gear is a combination of what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
A screw and a spur gear.
Can change the direction of motion.

30. What is the theoretical mechanical advantage of any gear train?
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A modification of an inclined plane.
Less than 1.

31. What is an example of a third class lever?
Opposite.
your arm.
Two surfaces move against one another.
2(pie)/pitch

32. What is the jack screw used for?
In pounds.
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

33. What is the purpose of a third class lever?
Positive mechanical advantage.
Same.
Door knob.
To speed up the motion of resistence.

34. Class two lever
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.
Shafts lying at any given angle.
fulcrum- weight- effort

35. What does a micrometer measure?
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
45

36. The bevel gear is used to connect what?
Shafts lying at any given angle.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.

37. What is one type of second class lever?
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

38. With a single fixed sheave what is the only mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

39. What direction does the effort and resistance move in first class levers?
Opposite.
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.
45

40. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.

41. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Shafts lying at any given angle.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
45

42. What is the formula for the mechanical advantage of a screw?
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
Feet.
1
2(pie)/pitch

43. A miter gear connects what?
Connects shafts having a 90 degree angle.
Less than 1.
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

44. What is the third thing a gear can do?
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.
Magnify or reduce the force which you apply.
Same.
your arm.

45. How can you decrease friction on flat surfaces?
A modification of an inclined plane.
32/8 = 4
With oil - grease or soap.
Same.

46. Work is measured in units also known as?
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
Foot- pounds
Same.

47. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
45
The force used to overcome friction is greater than the force used to do useful work.
In pounds.

48. hat is a screw?
A modification of an inclined plane.
Length of ramp/length of height from floor to truck
Simple machine
Same.

49. What is the mechanical advantage of a single movable block?
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.

50. What type of lever provides a fractional mechanical advantage?
Third class lever.
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.
fulcrum- weight- effort