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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 kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Can change the direction of 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.
Equals the weight of the object being hoisted.

2. What are first and third class levers used for?
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
Same.
2. Each half of the rope carries an equal amount of weight.

3. What is the theoretical mechanical advantage of any gear train?
Equals the weight of the object being hoisted.
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.
1

4. What is the formula for the wheel and axle?
Third class lever.
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
To magnify the applied force.
A screw and a spur gear.

5. What kind of machine is the inclined plane?
Opposite.
Simple machine
2(pie)/pitch
Can change the direction of motion.

6. What are the 4 forces?
Simple machine
Feet.
1
Gravity - Magnetism - Friction - Recoil

7. What does a micrometer measure?
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Shafts lying at any given angle.

8. What is the second thing a gear can do?
45
Increase or decrease the the speed of the applied motion.
Foot- pounds
A screw and a spur gear.

9. The worm gear is a combination of what?
The rope that passes through your hands is greater than the distance that the load is raised.
A modification of an inclined plane.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.

10. What is one type of second class lever?
Wheel and axle.
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.
The force used to overcome friction is greater than the force used to do useful work.

11. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil

12. How do you measure power?
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
Foot- pounds
To raise a house or other heavy machinery.

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

14. A miter gear connects what?
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.
32/8 = 4

15. What direction does the effort and resistance move in the second class levers?
A few thousandths of an inch.
Same.
Gravity - Magnetism - Friction - Recoil
In pounds.

16. What is the lever formula?
Work=Force*Distance
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Increase or decrease the the speed of the applied motion.

17. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Less than 1.
Equals the weight of the object being hoisted.
Can change the direction of motion.
Feet.

18. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
your arm.
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

19. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

20. How can you figure out the mechanical advantage of most block and falls by glance?
Equals the weight of the object being hoisted.
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

21. What is the first thing a gear can do?
Shafts lying at any given angle.
Can change the direction of motion.
To raise a house or other heavy machinery.
A modification of an inclined plane.

22. What direction does the effort and resistance move in third class levers.
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
In pounds.
Same.

23. What type of lever provides a fractional mechanical advantage?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Third class lever.
2. Each half of the rope carries an equal amount of weight.
1

24. How is distance measured in work?
Feet.
The change of the direction of the pull.
2(pie)/pitch
Opposite.

25. Formula for fractional mechanical disadvantage.
Positive mechanical advantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.

26. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
With oil - grease or soap.
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.

27. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
Shafts lying at any given angle.
Wheel and axle.

28. What is the power formula?
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.

29. What is the mechanical advantage for a single fixed block?
1
Same.
Simple machine
Can change the direction of motion.

30. How is force measured in work?
Simple machine
In pounds.
To magnify the applied force.
Connects shafts having a 90 degree angle.

31. 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.
To speed up the motion of resistence.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Direction - speed or size of the force applied.

32. What is the purpose of a third class lever?
To speed up the motion of resistence.
With oil - grease or soap.
Foot- pounds
Connects shafts having a 90 degree angle.

33. The threads of a screw are cut so?
Direction - speed or size of the force applied.
Two surfaces move against one another.
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.

34. Work is measured in units also known as?
Same.
When a resistance is overcome by a force acting through a measurable distance.
Door knob.
Foot- pounds

35. The miter gear faces are beveled at what angle?
1
45
32/8 = 4
Same.

36. Class two lever
Power=Work/Time
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort

37. What is the third thing a gear can do?
Wheel and axle.
Magnify or reduce the force which you apply.
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

38. What is the work formula?
Third class lever.
Direction - speed or size of the force applied.
Foot- pounds
Work=Force*Distance

39. What direction does the effort and resistance move in first class levers?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To speed up the motion of resistence.
Opposite.
With oil - grease or soap.

40. How is work done?
Wheel and axle.
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort

41. 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?
To magnify the applied force.
fulcrum- weight- effort
32/8 = 4
Same.

42. Friction is involved when?
Two surfaces move against one another.
Same.
Feet.
Simple machine

43. How can you decrease friction on flat surfaces?
Opposite.
With oil - grease or soap.
Foot- pounds
A modification of an inclined plane.

44. What is an example of a third class lever?
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.
Same.
your arm.

45. An egg beater has a mechanical advantage of what?
Less than 1.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
Same.

46. What is another example of a wheel and axle?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.
Positive mechanical advantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

47. How do you find the mechanical advantage?
Same.
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.
Direction - speed or size of the force applied.

48. What is another way to find the mechanical advantage of an inclined plane?
Increase or decrease the the speed of the applied motion.
1
Door knob.
Length of ramp/length of height from floor to truck

49. hat is a screw?
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil
32/8 = 4
Length of ramp/length of height from floor to truck

50. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.