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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.
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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 second thing a gear can do?
Can change the direction of motion.
Direction - speed or size of the force applied.
Door knob.
Increase or decrease the the speed of the applied motion.

2. What does a micrometer measure?
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
A few thousandths of an inch.
To raise a house or other heavy machinery.

3. 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?
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4
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.

4. What is the lever formula?
When a resistance is overcome by a force acting through a measurable distance.
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.
fulcrum- weight- effort

5. How do you find the mechanical advantage?
Same.
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.
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.

6. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
1

7. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
Magnify or reduce the force which you apply.

8. Fractional mechanical advantage
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

9. 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.
In pounds.
A few thousandths of an inch.
Power=Work/Time

10. What direction does the effort and resistance move in the second class levers?
fulcrum- weight- effort
A few thousandths of an inch.
The change of the direction of the pull.
Same.

11. What is the third thing a gear can do?
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.
45

12. What is the mechanical advantage for a single fixed block?
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
1
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.

13. What is one type of second class lever?
Wheel and axle.
In pounds.
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

14. The threads of a screw are cut so?
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
Foot- pounds

15. How is distance measured in work?
Feet.
Opposite.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.

16. What are first and third class levers used for?
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

17. hat is a screw?
Less than 1.
2(pie)/pitch
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.

18. How is force measured in work?
To magnify the applied force.
Door knob.
In pounds.
Opposite.

19. What kind of machine is the inclined plane?
Less than 1.
A modification of an inclined plane.
Simple machine
Gravity - Magnetism - Friction - Recoil

20. What is the formula for the mechanical advantage of a screw?
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
2(pie)/pitch
A modification of an inclined plane.

21. The miter gear faces are beveled at what angle?
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
45

22. With a single fixed sheave what is the only mechanical advantage?
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 change of the direction of the pull.
Feet.
A modification of an inclined plane.

23. What kind of mechanical advantage does the first and second class lever provide?
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.
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.

24. What is the work formula?
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
Less than 1.
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.

25. What is an example of a third class lever?
your arm.
Less than 1.
Work=Force*Distance
Third class lever.

26. What is the jack screw used for?
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
To raise a house or other heavy machinery.
fulcrum- weight- effort

27. What direction does the effort and resistance move in third class levers.
Same.
A few thousandths of an inch.
Opposite.
45

28. Work is measured in units also known as?
Foot- pounds
In Horsepower.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.

29. What is the theoretical mechanical advantage of any gear train?
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.
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 another way to find the mechanical advantage of an inclined plane?
To magnify the applied force.
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
A screw and a spur gear.

31. Gears can do a job for you by changing what three things?
Wheel and axle.
2(pie)/pitch
Direction - speed or size of the force applied.
Feet.

32. What is another example of a wheel and axle?
Direction - speed or size of the force applied.
A few thousandths of an inch.
Less than 1.
Door knob.

33. What direction does the effort and resistance move in first class levers?
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
Door knob.
Work=Force*Distance

34. What is the power formula?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance
A modification of an inclined plane.
Power=Work/Time

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

36. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.

37. What are the 4 forces?
In pounds.
Feet.
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.

38. Class two lever
Two surfaces move against one another.
With oil - grease or soap.
Opposite.
fulcrum- weight- effort

39. How can you decrease friction on flat surfaces?
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

40. What is the first thing a gear can do?
Can change the direction of motion.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.

41. What type of lever provides a fractional mechanical advantage?
In Horsepower.
Positive mechanical advantage.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.

42. What is the purpose of a third class lever?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.
To speed up the motion of resistence.
Equals the weight of the object being hoisted.

43. The bevel gear is used to connect what?
Positive mechanical advantage.
Shafts lying at any given angle.
Foot- pounds
Equals the weight of the object being hoisted.

44. A miter gear connects what?
Wheel and axle.
Connects shafts having a 90 degree angle.
The force used to overcome friction is greater than the force used to do useful work.
In pounds.

45. 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.
1
Can change the direction of motion.
A screw and a spur gear.

46. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.

47. Formula for fractional mechanical disadvantage.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
Equals the weight of the object being hoisted.

48. Friction is involved when?
Work=Force*Distance
Two surfaces move against one another.
Door knob.
In Horsepower.

49. How do you measure power?
Shafts lying at any given angle.
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 modification of an inclined plane.
In Horsepower.

50. 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.
Increase or decrease the the speed of the applied motion.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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