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Mechanical Systems 3

Instructions:

Answer 50 questions in 20 minutes. 1 minute extra for reading the instructions.
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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 mechanical advantage for a single fixed block?
The force used to overcome friction is greater than the force used to do useful work.
1
Shafts lying at any given angle.
Third class lever.

2. Friction is involved when?
Length of ramp/length of height from floor to truck
Magnify or reduce the force which you apply.
In pounds.
Two surfaces move against one another.

3. How do you find the mechanical advantage?
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.
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

4. 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.
In Horsepower.
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.

5. What kind of mechanical advantage does the first and second class lever provide?
Door knob.
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
Power=Work/Time

6. Work is measured in units also known as?
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
Simple machine

7. 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?
32/8 = 4
Work=Force*Distance
your arm.
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

8. What is the second thing a gear can do?
Same.
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Two surfaces move against one another.

9. How can you decrease friction on flat surfaces?
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
Can change the direction of motion.
With oil - grease or soap.

10. How can you figure out the mechanical advantage of most block and falls by glance?
To magnify the applied force.
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.
Count the number of parts of the rope going to and from the movable block.

11. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
fulcrum- weight- effort
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.

12. What direction does the effort and resistance move in the second class levers?
Same.
1
The change of the direction of the pull.
Less than 1.

13. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
To raise a house or other heavy machinery.
Can change the direction of motion.
Equals the weight of the object being hoisted.

14. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
When a resistance is overcome by a force acting through a measurable distance.

15. What type of lever provides a fractional mechanical advantage?
Simple machine
Third class lever.
Power=Work/Time
To speed up the motion of resistence.

16. The worm gear is a combination of what?
45
Simple machine
A screw and a spur gear.
Less than 1.

17. What is an example of a third class lever?
Foot- pounds
To raise a house or other heavy machinery.
your arm.
In Horsepower.

18. hat is a screw?
your arm.
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.
To speed up the motion of resistence.

19. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.

20. Class two lever
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance
A few thousandths of an inch.
fulcrum- weight- effort

21. What is the ratio of any gear train?
Simple machine
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.
2. Each half of the rope carries an equal amount of weight.

22. The bevel gear is used to connect what?
To magnify the applied force.
Can change the direction of motion.
Direction - speed or size of the force applied.
Shafts lying at any given angle.

23. Fractional mechanical advantage
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

24. What is the power formula?
Shafts lying at any given angle.
Positive mechanical advantage.
A few thousandths of an inch.
Power=Work/Time

25. What is the jack screw used for?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
To raise a house or other heavy machinery.

26. What is the purpose of a third class lever?
With oil - grease or soap.
Foot- pounds
Less than 1.
To speed up the motion of resistence.

27. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
A screw and a spur gear.
1
To speed up the motion of resistence.

28. An egg beater has a mechanical advantage of what?
your arm.
Foot- pounds
Same.
Less than 1.

29. What direction does the effort and resistance move in first class levers?
To magnify the applied force.
Opposite.
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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

30. How is distance measured in work?
2(pie)/pitch
Feet.
A few thousandths of an inch.
In pounds.

31. What is the formula for the wheel and axle?
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 magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.

32. What is one type of second class lever?
Wheel and axle.
Positive mechanical advantage.
In Horsepower.
Foot- pounds

33. The threads of a screw are cut so?
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
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

34. 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
Foot- pounds
Simple machine

35. How is force measured in work?
The change of the direction of the pull.
In pounds.
Shafts lying at any given angle.
Less than 1.

36. What is the work formula?
Can change the direction of motion.
Simple machine
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance

37. What does a micrometer measure?
A few thousandths of an inch.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.

38. Gears can do a job for you by changing what three things?
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.
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck

39. What are first and third class levers used for?
Third class lever.
A screw and a spur gear.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.

40. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
A modification of an inclined plane.
Same.
Equals the weight of the object being hoisted.

41. What is the mechanical advantage of a single movable block?
A few thousandths of an inch.
In Horsepower.
1
2. Each half of the rope carries an equal amount of weight.

42. What is another example of a wheel and axle?
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
Door knob.
Positive mechanical advantage.
A modification of an inclined plane.

43. How do you measure power?
2(pie)/pitch
Length of ramp/length of height from floor to truck
In Horsepower.
Direction - speed or size of the force applied.

44. What is the first thing a gear can do?
Can change the direction of motion.
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.

45. The miter gear faces are beveled at what angle?
Power=Work/Time
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
45

46. What kind of machine is the inclined plane?
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort
A few thousandths of an inch.

47. A miter gear connects what?
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.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.

48. What direction does the effort and resistance move in third class levers.
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.
Feet.
Same.
Connects shafts having a 90 degree angle.

49. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
A few thousandths of an inch.
In Horsepower.

50. What is another way to find the mechanical advantage of an inclined plane?
With oil - grease or soap.
Wheel and axle.
Same.
Length of ramp/length of height from floor to truck