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

2. What is the power formula?
Feet.
Magnify or reduce the force which you apply.
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.

3. What kind of machine is the inclined plane?
Door knob.
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
A modification of an inclined plane.

4. What is the mechanical advantage for a single fixed block?
fulcrum- weight- effort
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.
1
To raise a house or other heavy machinery.

5. With a single fixed sheave what is the only mechanical advantage?
A few thousandths of an inch.
45
The change of the direction of the pull.
Feet.

6. What is the work formula?
In pounds.
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.

7. What is the first thing a gear can do?
Can change the direction of motion.
Third class lever.
With oil - grease or soap.
Simple machine

8. What is the third thing a gear can do?
To speed up the motion of resistence.
Feet.
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

9. Friction is involved when?
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.
Two surfaces move against one another.
A screw and a spur gear.

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

11. How do you find the mechanical advantage?
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.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.

12. What are the 4 forces?
Work=Force*Distance
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
Wheel and axle.

13. What is the formula for the wheel and axle?
1
Length of ramp/length of height from floor to truck
Less than 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

14. What direction does the effort and resistance move in first class levers?
Same.
Increase or decrease the the speed of the applied motion.
Opposite.
In pounds.

15. What is the mechanical advantage of a single movable block?
Foot- pounds
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.

16. What are first and third class levers used for?
To raise a house or other heavy machinery.
To magnify the applied force.
A modification of an inclined plane.
Foot- pounds

17. A miter gear connects what?
Connects shafts having a 90 degree angle.
The change of the direction of the pull.
Less than 1.
Feet.

18. What kind of mechanical advantage does the first and second class lever provide?
2. Each half of the rope carries an equal amount of weight.
Simple machine
Positive mechanical advantage.
In pounds.

19. Fractional mechanical advantage
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
To raise a house or other heavy machinery.

20. Gears can do a job for you by changing what three things?
Third class lever.
Direction - speed or size of the force applied.
Simple machine
45

21. What is the purpose of a 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.
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.
Less than 1.

22. 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.
32/8 = 4
To speed up the motion of resistence.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

23. 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
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.

24. How is distance measured in work?
Feet.
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.
To magnify the applied force.

25. What is the lever formula?
Door knob.
Third class lever.
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.

26. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

27. Work is measured in units also known as?
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
Foot- pounds

28. What is the ratio of any gear train?
Power=Work/Time
With oil - grease or soap.
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.

29. The miter gear faces are beveled at what angle?
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.
45
Simple machine

30. How is work done?
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
Magnify or reduce the force which you apply.

31. What is the jack screw used for?
Can change the direction of motion.
Third class lever.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.

32. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
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.
Equals the weight of the object being hoisted.

33. 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.
The change of the direction of the pull.
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.

34. How is force measured in work?
In pounds.
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
Door knob.

35. The bevel gear is used to connect what?
Third class lever.
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort

36. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.
With oil - grease or soap.
Equals the weight of the object being hoisted.

37. Class two lever
Simple machine
fulcrum- weight- effort
A few thousandths of an inch.
A screw and a spur gear.

38. How can you figure out the mechanical advantage of most block and falls by glance?
45
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
A few thousandths of an inch.

39. hat is a screw?
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

40. Formula for fractional mechanical disadvantage.
Foot- pounds
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.
A few thousandths of an inch.

41. How do you measure power?
Feet.
Shafts lying at any given angle.
In Horsepower.
Length of ramp/length of height from floor to truck

42. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.

43. What type of lever provides a fractional mechanical advantage?
Two surfaces move against one another.
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.
Third class lever.
Connects shafts having a 90 degree angle.

44. What direction does the effort and resistance move in third class levers.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
In Horsepower.

45. The worm gear is a combination of what?
Positive mechanical advantage.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To raise a house or other heavy machinery.

46. What is one type of second class lever?
A few thousandths of an inch.
Wheel and axle.
2(pie)/pitch
Same.

47. What is an example of a third class lever?
To magnify the applied force.
Power=Work/Time
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

48. How can you decrease friction on flat surfaces?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.

49. What direction does the effort and resistance move in the second class levers?
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.
2(pie)/pitch
Same.

50. What does a micrometer measure?
Third class lever.
A few thousandths of an inch.
Magnify or reduce the force which you apply.
Door knob.