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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 first thing a gear can do?
your arm.
Less than 1.
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.

2. What direction does the effort and resistance move in third class levers.
Same.
32/8 = 4
1
The rope that passes through your hands is greater than the distance that the load is raised.

3. What is the second thing a gear can do?
In Horsepower.
Feet.
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

4. What is the theoretical mechanical advantage of any gear train?
A few thousandths of an inch.
Equals the weight of the object being hoisted.
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

5. Friction is involved when?
Work=Force*Distance
Two surfaces move against one another.
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.

6. How is work done?
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Foot- pounds

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

8. What does a micrometer measure?
Can change the direction of motion.
A screw and a spur gear.
Same.
A few thousandths of an inch.

9. The bevel gear is used to connect what?
Equals the weight of the object being hoisted.
fulcrum- weight- effort
In pounds.
Shafts lying at any given angle.

10. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
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.
32/8 = 4
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

11. What is the jack screw used for?
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
Opposite.
Foot- pounds

12. What is an example of a third class lever?
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

13. What is the formula for the wheel and axle?
Gravity - Magnetism - Friction - Recoil
Simple machine
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.

14. What kind of mechanical advantage does the first and second class lever provide?
Can change the direction of motion.
With oil - grease or soap.
32/8 = 4
Positive mechanical advantage.

15. A miter gear connects what?
Connects shafts having a 90 degree angle.
Same.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.

16. Class two lever
45
A screw and a spur gear.
fulcrum- weight- effort
A modification of an inclined plane.

17. What are first and third class levers used for?
Can change the direction of motion.
To magnify the applied force.
45
32/8 = 4

18. How do you measure power?
A screw and a spur gear.
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time

19. What is the mechanical advantage for a single fixed block?
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.
1
Two surfaces move against one another.

20. The threads of a screw are cut so?
your arm.
With oil - grease or soap.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.

21. With a single fixed sheave what is the only mechanical advantage?
Work=Force*Distance
fulcrum- weight- effort
The change of the direction of the pull.
To magnify the applied force.

22. How is force measured in work?
To magnify the applied force.
Connects shafts having a 90 degree angle.
In pounds.
Shafts lying at any given angle.

23. Fractional mechanical advantage
45
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine

24. What direction does the effort and resistance move in first class levers?
your arm.
Direction - speed or size of the force applied.
Opposite.
Count the number of parts of the rope going to and from the movable block.

25. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Wheel and axle.
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.

26. 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.
Feet.
Same.
Count the number of parts of the rope going to and from the movable block.

27. An egg beater has a mechanical advantage of what?
Shafts lying at any given angle.
Less than 1.
Wheel and axle.
Opposite.

28. What is the purpose of a third class lever?
Gravity - Magnetism - Friction - Recoil
In Horsepower.
To speed up the motion of resistence.
A modification of an inclined plane.

29. What type of lever provides a fractional mechanical advantage?
Third class lever.
Less than 1.
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil

30. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
The force used to overcome friction is greater than the force used to do useful work.

31. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Opposite.
Work=Force*Distance
Equals the weight of the object being hoisted.
Positive mechanical advantage.

32. What kind of machine is the inclined plane?
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.

33. hat is a screw?
In pounds.
A modification of an inclined plane.
32/8 = 4
Gravity - Magnetism - Friction - Recoil

34. What is another example of a wheel and axle?
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

35. Formula for fractional mechanical disadvantage.
A screw and a spur gear.
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 speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

36. What is one type of second class lever?
Wheel and axle.
Opposite.
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.

37. Work is measured in units also known as?
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
32/8 = 4
Wheel and axle.
Foot- pounds

38. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Simple machine
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.

39. What are the 4 forces?
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

40. What is the ratio of any gear train?
Same.
Wheel and axle.
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.

41. 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.
The change of the direction of the pull.
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

42. How is distance measured in work?
Feet.
Foot- pounds
Can change the direction of motion.
Same.

43. 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?
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.
32/8 = 4
Third class lever.

44. What is the work formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Power=Work/Time
Two surfaces move against one another.
Work=Force*Distance

45. How do you find the mechanical advantage?
Two surfaces move against one another.
Less than 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.
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.

46. Gears can do a job for you by changing what three things?
In pounds.
Two surfaces move against one another.
Direction - speed or size of the force applied.
2(pie)/pitch

47. What is the power formula?
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
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
Power=Work/Time

48. The worm gear is a combination of what?
To raise a house or other heavy machinery.
A screw and a spur gear.
Less than 1.
Shafts lying at any given angle.

49. The miter gear faces are beveled at what angle?
To magnify the applied force.
45
Third class lever.
A modification of an inclined plane.

50. What is the mechanical advantage of a single movable block?
In Horsepower.
Count the number of parts of the rope going to and from the movable block.
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.