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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 third thing a gear can do?
Shafts lying at any given angle.
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 rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.

2. A miter gear connects what?
1
Connects shafts having a 90 degree angle.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.

3. What is the power formula?
Power=Work/Time
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds

4. What kind of machine is the inclined plane?
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Simple machine
Third class lever.

5. 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
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.
Wheel and axle.

6. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Work=Force*Distance
To raise a house or other heavy machinery.
Third class lever.

7. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Simple machine
Wheel and axle.
In pounds.

8. How is distance measured in work?
Power=Work/Time
With oil - grease or soap.
Feet.
Opposite.

9. What direction does the effort and resistance move in the second class levers?
To raise a house or other heavy machinery.
Door knob.
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.

10. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.

11. The worm gear is a combination of what?
A modification of an inclined plane.
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
Increase or decrease the the speed of the applied motion.

12. How is work done?
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.
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.

13. What is the formula for the mechanical advantage of a screw?
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
Direction - speed or size of the force applied.

14. Class two lever
32/8 = 4
With oil - grease or soap.
Foot- pounds
fulcrum- weight- effort

15. The miter gear faces are beveled at what angle?
45
To speed up the motion of resistence.
your arm.
32/8 = 4

16. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
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.
Count the number of parts of the rope going to and from the movable block.

17. What is the work formula?
Direction - speed or size of the force applied.
Work=Force*Distance
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.

18. What direction does the effort and resistance move in first class levers?
Magnify or reduce the force which you apply.
2(pie)/pitch
Opposite.
your arm.

19. The bevel gear is used to connect what?
Less than 1.
Simple machine
Same.
Shafts lying at any given angle.

20. What are first and third class levers used for?
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
To magnify the applied force.

21. Friction is involved when?
Two surfaces move against one another.
Same.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

22. What is another example of a wheel and axle?
Door knob.
Positive mechanical advantage.
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.

23. What is the formula for the wheel and axle?
1
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
Same.
Increase or decrease the the speed of the applied motion.

24. An egg beater has a mechanical advantage of what?
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.

25. How can you figure out the mechanical advantage of most block and falls by glance?
Same.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

26. What is the mechanical advantage of a single movable block?
A few thousandths of an inch.
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.

27. How is force measured in work?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.
Positive mechanical advantage.
your arm.

28. What is the first thing a gear can do?
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In Horsepower.
Opposite.

29. What is the ratio of any gear train?
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.
Opposite.
A few thousandths of an inch.

30. The threads of a screw are cut so?
Work=Force*Distance
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.
Equals the weight of the object being hoisted.

31. What direction does the effort and resistance move in third class levers.
your arm.
The change of the direction of the pull.
Same.
fulcrum- weight- effort

32. How can you decrease friction on flat surfaces?
With oil - grease or soap.
To magnify the applied force.
Feet.
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

33. What is the jack screw used for?
2(pie)/pitch
To raise a house or other heavy machinery.
The change of the direction of the pull.
A screw and a spur gear.

34. What type of lever provides a fractional mechanical advantage?
Equals the weight of the object being hoisted.
Third class lever.
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.
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

35. 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?
Can change the direction of motion.
32/8 = 4
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

36. What is an example of a third class lever?
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.

37. 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.
To speed up the motion of resistence.
Third class lever.
To raise a house or other heavy machinery.

38. Fractional mechanical advantage
Can change the direction of motion.
Foot- pounds
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.

39. What does a micrometer measure?
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
Positive mechanical advantage.

40. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
Direction - speed or size of the force applied.
Positive mechanical advantage.

41. What is one type of second class lever?
Wheel and axle.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

42. What are the 4 forces?
A few thousandths of an inch.
With oil - grease or soap.
Third class lever.
Gravity - Magnetism - Friction - Recoil

43. What is the purpose of a third class lever?
Direction - speed or size of the force applied.
2(pie)/pitch
A screw and a spur gear.
To speed up the motion of resistence.

44. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.
Same.

45. How do you find the mechanical advantage?
Direction - speed or size of the force applied.
In Horsepower.
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.
Power=Work/Time

46. What is the mechanical advantage for a single fixed block?
1
Work=Force*Distance
To raise a house or other heavy machinery.
In pounds.

47. Work is measured in units also known as?
Direction - speed or size of the force applied.
Foot- pounds
A modification of an inclined plane.
Shafts lying at any given angle.

48. How do you measure power?
A few thousandths of an inch.
A modification of an inclined plane.
In Horsepower.
Less than 1.

49. hat is a screw?
Less than 1.
fulcrum- weight- effort
A modification of an inclined plane.
Power=Work/Time

50. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
1
In Horsepower.
Door knob.