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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 are the 4 forces?
Gravity - Magnetism - Friction - Recoil
your arm.
2(pie)/pitch
Work=Force*Distance

2. What is the third thing a gear can do?
Wheel and axle.
Feet.
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.

3. What is another way to find the mechanical advantage of an inclined plane?
To magnify the applied force.
Simple machine
Two surfaces move against one another.
Length of ramp/length of height from floor to truck

4. What is the work formula?
A screw and a spur gear.
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.
45

5. What does a micrometer measure?
Two surfaces move against one another.
Direction - speed or size of the force applied.
A few thousandths of an inch.
Same.

6. 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
Two surfaces move against one another.
Simple machine
Less than 1.

7. How is force measured in work?
Connects shafts having a 90 degree angle.
In pounds.
Opposite.
Simple machine

8. The miter gear faces are beveled at what angle?
45
2(pie)/pitch
A few thousandths of an inch.
fulcrum- weight- effort

9. What type of lever provides a fractional mechanical advantage?
Third class lever.
Simple machine
Less than 1.
Same.

10. What kind of machine is the inclined plane?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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
Door knob.

11. The bevel gear is used to connect what?
Shafts lying at any given angle.
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.
fulcrum- weight- effort

12. Gears can do a job for you by changing what three things?
Opposite.
Direction - speed or size of the force applied.
Two surfaces move against one another.
Equals the weight of the object being hoisted.

13. How do you measure power?
Positive mechanical advantage.
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 Horsepower.
Equals the weight of the object being hoisted.

14. What direction does the effort and resistance move in third class levers.
Shafts lying at any given angle.
fulcrum- weight- effort
Same.
your arm.

15. An egg beater has a mechanical advantage of what?
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Simple machine
Less than 1.

16. What is one type of second class lever?
Foot- pounds
Wheel and axle.
2(pie)/pitch
1

17. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Opposite.
The change of the direction of the pull.
A modification of an inclined plane.
Equals the weight of the object being hoisted.

18. What is the purpose of a third class lever?
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.
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 modification of an inclined plane.

19. Formula for fractional mechanical disadvantage.
your arm.
Equals the weight of the object being hoisted.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

20. What direction does the effort and resistance move in the second class levers?
fulcrum- weight- effort
In Horsepower.
Direction - speed or size of the force applied.
Same.

21. What is the formula for the mechanical advantage of a screw?
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
2(pie)/pitch
In pounds.

22. How can you figure out the mechanical advantage of most block and falls by glance?
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.

23. How can you decrease friction on flat surfaces?
Simple machine
Magnify or reduce the force which you apply.
With oil - grease or soap.
Door knob.

24. What kind of mechanical advantage does the first and second class lever provide?
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
Positive mechanical advantage.
Foot- pounds
Opposite.

25. With a single fixed sheave what is the only mechanical advantage?
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.
The change of the direction of the pull.

26. Class two lever
fulcrum- weight- effort
To speed up the motion of resistence.
Direction - speed or size of the force applied.
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. Work is measured in units also known as?
The change of the direction of the pull.
To magnify the applied force.
Third class lever.
Foot- pounds

28. How do you find the mechanical advantage?
Two surfaces move against one another.
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.
fulcrum- weight- effort
Shafts lying at any given angle.

29. hat is a screw?
Simple machine
A modification of an inclined plane.
Same.
A few thousandths of an inch.

30. What is the power formula?
The force used to overcome friction is greater than the force used to do useful work.
Opposite.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

31. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
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.

32. What is the second thing a gear can do?
Less than 1.
Feet.
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

33. The worm gear is a combination of what?
Feet.
The change of the direction of the pull.
A screw and a spur gear.
Third class lever.

34. What is the ratio of any gear train?
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.
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
your arm.

35. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.

36. What is the jack screw used for?
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.
your arm.
45

37. What is the first thing a gear can do?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
45
Can change the direction of motion.
To speed up the motion of resistence.

38. What is the lever formula?
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.
Opposite.

39. How is work done?
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Equals the weight of the object being hoisted.

40. What direction does the effort and resistance move in first class levers?
Length of ramp/length of height from floor to truck
Opposite.
Third class lever.
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. A miter gear connects what?
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
Same.
Length of ramp/length of height from floor to truck

42. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.

43. What are first and third class levers used for?
To magnify the applied force.
2(pie)/pitch
Foot- pounds
To speed up the motion of resistence.

44. Fractional mechanical advantage
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.
With oil - grease or soap.

45. What is another example of a wheel and axle?
Door knob.
Can change the direction of motion.
A few thousandths of an inch.
45

46. What is the mechanical advantage for a single fixed block?
The change of the direction of the pull.
Can change the direction of motion.
45
1

47. How is distance measured in work?
Shafts lying at any given angle.
your arm.
Two surfaces move against one another.
Feet.

48. What is the theoretical mechanical advantage of any gear train?
Less than 1.
Connects shafts having a 90 degree angle.
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

49. What is an example of a third class lever?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
your arm.
When a resistance is overcome by a force acting through a measurable distance.

50. What is the formula for the wheel and axle?
Foot- pounds
Same.
2(pie)/pitch
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