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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 direction does the effort and resistance move in third class levers.
Same.
Direction - speed or size of the force applied.
In pounds.
Positive mechanical advantage.

2. What are the 4 forces?
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil

3. What is the purpose of a third class lever?
Length of ramp/length of height from floor to truck
2(pie)/pitch
To speed up the motion of resistence.
To raise a house or other heavy machinery.

4. What type of lever provides a fractional 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.
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 raise a house or other heavy machinery.

5. What does a micrometer measure?
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.
Wheel and axle.

6. hat is a screw?
In pounds.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.

7. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.
your arm.
When a resistance is overcome by a force acting through a measurable distance.

8. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.

9. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Foot- pounds
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
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.

10. The miter gear faces are beveled at what angle?
Same.
Increase or decrease the the speed of the applied motion.
45
Positive mechanical advantage.

11. What direction does the effort and resistance move in first class levers?
1
Two surfaces move against one another.
A screw and a spur gear.
Opposite.

12. What is the power formula?
Two surfaces move against one another.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
With oil - grease or soap.

13. What is the mechanical advantage for a single fixed block?
1
Same.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

14. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time
Feet.
Simple machine

15. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.

16. What is one type of second class lever?
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.

17. What is the formula for the wheel and axle?
A few thousandths of an inch.
45
Count the number of parts of the rope going to and from the movable 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

18. What is another way to find the mechanical advantage of an inclined plane?
Third class lever.
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
Magnify or reduce the force which you apply.

19. 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.
Two surfaces move against one another.
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 screw and a spur gear.

20. Work is measured in units also known as?
Same.
Foot- pounds
Wheel and axle.
A modification of an inclined plane.

21. What is the third thing a gear can do?
1
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Wheel and axle.

22. How do you find the mechanical advantage?
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
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.
Door knob.

23. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Equals the weight of the object being hoisted.
Same.
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.

24. An egg beater has a mechanical advantage of what?
Door knob.
Can change the direction of motion.
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.

25. What is another example of a wheel and axle?
Door knob.
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

26. What is the jack screw used for?
Less than 1.
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.

27. What is the work formula?
Door knob.
Work=Force*Distance
Magnify or reduce the force which you apply.
fulcrum- weight- effort

28. The bevel gear is used to connect what?
Same.
Shafts lying at any given angle.
A modification of an inclined plane.
Wheel and axle.

29. What is an example of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil

30. Gears can do a job for you by changing what three things?
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
A screw and a spur 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

31. How can you figure out the mechanical advantage of most block and falls by glance?
32/8 = 4
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.
Count the number of parts of the rope going to and from the movable block.

32. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Can change the direction of motion.
Wheel and axle.
With oil - grease or soap.

33. 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
32/8 = 4
Connects shafts having a 90 degree angle.
Can change the direction of motion.

34. Fractional mechanical advantage
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
The change of the direction of the pull.

35. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
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
With oil - grease or soap.

36. What kind of machine is the inclined plane?
Power=Work/Time
45
Simple machine
Door knob.

37. Friction is involved when?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.
The change of the direction of the pull.

38. What is the formula for the mechanical advantage of a screw?
The change of the direction of the pull.
2(pie)/pitch
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

39. What are first and third class levers used for?
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.
2(pie)/pitch
Power=Work/Time

40. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
45
Can change the direction of motion.

41. What direction does the effort and resistance move in the second class levers?
Same.
With oil - grease or soap.
A few thousandths of an inch.
The change of the direction of the pull.

42. Class two lever
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.
With oil - grease or soap.
Feet.

43. How is distance measured in work?
Feet.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Simple machine

44. How do you measure power?
In Horsepower.
45
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.

45. How is force measured in work?
Same.
In pounds.
Work=Force*Distance
The change of the direction of the pull.

46. The threads of a screw are cut so?
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.

47. A miter gear connects what?
A screw and a spur gear.
Connects shafts having a 90 degree angle.
Feet.
Length of ramp/length of height from floor to truck

48. What is the lever formula?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.
Door knob.

49. The worm gear is a combination of what?
To speed up the motion of resistence.
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.
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.

50. How can you decrease friction on flat surfaces?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
With oil - grease or soap.
In Horsepower.
Same.