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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 first thing a gear can do?
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil

2. Friction is involved when?
Two surfaces move against one another.
Equals the weight of the object being hoisted.
Opposite.
2(pie)/pitch

3. hat is a screw?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
A modification of an inclined plane.
Feet.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

4. What is the power formula?
Power=Work/Time
fulcrum- weight- effort
Shafts lying at any given angle.
45

5. What is the formula for the wheel and axle?
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
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

6. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Equals the weight of the object being hoisted.
A screw and a spur gear.
Simple machine

7. What are the 4 forces?
Connects shafts having a 90 degree angle.
32/8 = 4
Power=Work/Time
Gravity - Magnetism - Friction - Recoil

8. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.

9. Work is measured in units also known as?
1
Foot- pounds
The change of the direction of the pull.
Equals the weight of the object being hoisted.

10. What type of lever provides a fractional mechanical advantage?
Foot- pounds
1
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

11. What kind of machine is the inclined plane?
2(pie)/pitch
1
Shafts lying at any given angle.
Simple machine

12. What is the mechanical advantage for a single fixed block?
45
1
Work=Force*Distance
Two surfaces move against one another.

13. How do you measure power?
In Horsepower.
Same.
45
Power=Work/Time

14. The threads of a screw are cut so?
1
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.

15. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.
2. Each half of the rope carries an equal amount of weight.

16. What is the purpose of a 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.
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
fulcrum- weight- effort

17. What does a micrometer measure?
Count the number of parts of the rope going to and from the movable block.
To speed up the motion of resistence.
A few thousandths of an inch.
Connects shafts having a 90 degree angle.

18. What is one type of second 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.
The change of the direction of the pull.
Wheel and axle.
To magnify the applied force.

19. A miter gear connects what?
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
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.

20. How can you figure out the mechanical advantage of most block and falls by glance?
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
Work=Force*Distance

21. Gears can do a job for you by changing what three things?
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
Direction - speed or size of the force applied.
Power=Work/Time
To speed up the motion of resistence.

22. What is an example of a third class lever?
A few thousandths of an inch.
To speed up the motion of resistence.
your arm.
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.

23. How can you decrease friction on flat surfaces?
Simple machine
To raise a house or other heavy machinery.
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.

24. An egg beater has a mechanical advantage of what?
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.
your arm.
Less than 1.

25. How is force measured in work?
1
In pounds.
Same.
Direction - speed or size of the force applied.

26. What direction does the effort and resistance move in first class levers?
In pounds.
your arm.
Opposite.
When a resistance is overcome by a force acting through a measurable distance.

27. What direction does the effort and resistance move in third class levers.
To speed up the motion of resistence.
Same.
32/8 = 4
Length of ramp/length of height from floor to truck

28. What is another example of a wheel and axle?
In Horsepower.
Feet.
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.

29. The bevel gear is used to connect what?
Same.
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.
2(pie)/pitch

30. 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?
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.
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4

31. The worm gear is a combination of what?
Length of ramp/length of height from floor to truck
Opposite.
A screw and a spur gear.
To magnify the applied force.

32. Class two lever
Positive mechanical advantage.
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.
fulcrum- weight- effort

33. What is the ratio of any gear train?
Count the number of parts of the rope going to and from the movable block.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

34. What is the formula for the mechanical advantage of a screw?
1
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
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.

35. What is the second thing a gear can do?
Opposite.
Same.
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.

36. What is the third thing a gear can do?
Gravity - Magnetism - Friction - Recoil
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.
Simple machine

37. How is work done?
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
Same.
In pounds.

38. What are first and third class levers used for?
The change of the direction of the pull.
To magnify the applied force.
Opposite.
Magnify or reduce the force which you apply.

39. What direction does the effort and resistance move in the second class levers?
2(pie)/pitch
Same.
A few thousandths of an inch.
Opposite.

40. 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.
Positive mechanical advantage.
A screw and a spur gear.
Opposite.

41. What is the mechanical advantage of a single 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.
2. Each half of the rope carries an equal amount of weight.
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

42. How do you find the mechanical advantage?
Length of ramp/length of height from floor to truck
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.
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.

43. With a single fixed sheave what is the only mechanical advantage?
Magnify or reduce the force which you apply.
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

44. What is the jack screw used for?
In pounds.
Equals the weight of the object being hoisted.
A screw and a spur gear.
To raise a house or other heavy machinery.

45. What is another way to find the mechanical advantage of an inclined plane?
Third class lever.
Work=Force*Distance
A screw and a spur gear.
Length of ramp/length of height from floor to truck

46. What is the lever formula?
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
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.

47. How is distance measured in work?
Simple machine
2(pie)/pitch
Feet.
fulcrum- weight- effort

48. The miter gear faces are beveled at what angle?
45
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2(pie)/pitch
1

49. What is the work formula?
In pounds.
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.

50. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
Third class lever.