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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. How do you measure power?
Length of ramp/length of height from floor to truck
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
Less than 1.

2. What is the ratio of any gear train?
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.

3. An egg beater has a mechanical advantage of what?
Less than 1.
To raise a house or other heavy machinery.
The change of the direction of the pull.
Count the number of parts of the rope going to and from the movable block.

4. What is the first thing a gear can do?
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Can change the direction of motion.
Simple machine

5. With a single fixed sheave what is the only mechanical advantage?
45
The change of the direction of the pull.
To speed up the motion of resistence.
Less than 1.

6. How is force measured in work?
In pounds.
Third class lever.
Gravity - Magnetism - Friction - Recoil
Wheel and axle.

7. The bevel gear is used to connect what?
In pounds.
Can change the direction of motion.
Shafts lying at any given angle.
With oil - grease or soap.

8. What is the theoretical mechanical advantage of any gear train?
Length of ramp/length of height from floor to truck
Door knob.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.

9. What kind of machine is the inclined plane?
Work=Force*Distance
Simple machine
Feet.
Third class lever.

10. The miter gear faces are beveled at what angle?
45
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
Wheel and axle.

11. Class two lever
In Horsepower.
Two surfaces move against one another.
Equals the weight of the object being hoisted.
fulcrum- weight- effort

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

13. What direction does the effort and resistance move in first class levers?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Feet.
A modification of an inclined plane.
Opposite.

14. Friction is involved when?
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
A modification of an inclined plane.
Two surfaces move against one another.

15. A miter gear connects what?
Connects shafts having a 90 degree angle.
Power=Work/Time
The change of the direction of the pull.
32/8 = 4

16. What direction does the effort and resistance move in third class levers.
Same.
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.
To speed up the motion of resistence.
To raise a house or other heavy machinery.

17. What is the mechanical advantage for a single fixed block?
1
Increase or decrease the the speed of the applied motion.
Same.
Simple machine

18. What is another way to find the mechanical advantage of an inclined plane?
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
Length of ramp/length of height from floor to truck
Power=Work/Time
Simple machine

19. What is the purpose of a third class lever?
Door knob.
To speed up the motion of resistence.
Work=Force*Distance
To raise a house or other heavy machinery.

20. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Opposite.
Positive mechanical advantage.
your arm.
Equals the weight of the object being hoisted.

21. What is the mechanical advantage of a single movable block?
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
A few thousandths of an inch.

22. 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?
In pounds.
Same.
Two surfaces move against one another.
32/8 = 4

23. What are first and third class levers used for?
To magnify the applied force.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
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.

24. What is the formula for the mechanical advantage of a screw?
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.
2(pie)/pitch
With oil - grease or soap.
A screw and a spur gear.

25. What is the lever formula?
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.
Feet.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

26. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
A modification of an inclined plane.
Less than 1.

27. The threads of a screw are cut so?
Two surfaces move against one another.
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time

28. What is the formula for the wheel and axle?
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.
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

29. Work is measured in units also known as?
Foot- pounds
Magnify or reduce the force which you apply.
32/8 = 4
45

30. How can you decrease friction on flat surfaces?
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.
With oil - grease or soap.
2(pie)/pitch

31. What is the power formula?
Less than 1.
Power=Work/Time
Simple machine
1

32. What is one type of second class lever?
2(pie)/pitch
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.
Wheel and axle.

33. Fractional mechanical advantage
The force used to overcome friction is greater than the force used to do useful work.
With oil - grease or soap.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

34. hat is a screw?
A modification of an inclined plane.
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.
Less than 1.

35. What are the 4 forces?
Length of ramp/length of height from floor to truck
Third class lever.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil

36. What kind of mechanical advantage does the first and second class lever provide?
fulcrum- weight- effort
Positive mechanical advantage.
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.

37. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.
Same.

38. What is another example of a wheel and axle?
Two surfaces move against one another.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
Door knob.

39. What is an example of a third class lever?
To speed up the motion of resistence.
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.
In Horsepower.

40. What does a micrometer measure?
A few thousandths of an inch.
Feet.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.

41. The worm gear is a combination of what?
Magnify or reduce the force which you apply.
Door knob.
A screw and a spur gear.
Opposite.

42. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.

43. What is the work formula?
Simple machine
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.

44. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
A few thousandths of an inch.
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.
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. What is the jack screw used for?
Connects shafts having a 90 degree angle.
In Horsepower.
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.

46. How do you find the mechanical advantage?
Less than 1.
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.
Two surfaces move against one another.
Wheel and axle.

47. How is distance measured in work?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.
fulcrum- weight- effort
Wheel and axle.

48. What direction does the effort and resistance move in the second class levers?
32/8 = 4
Can change the direction of motion.
In pounds.
Same.

49. Formula for fractional mechanical disadvantage.
Door knob.
The change of the direction of the pull.
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.

50. What is the third thing a gear can do?
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
32/8 = 4