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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 formula for the mechanical advantage of a screw?
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
To speed up the motion of resistence.

2. What is the first thing a gear can do?
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.
Less than 1.
Can change the direction of motion.

3. Fractional mechanical advantage
Door knob.
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.

4. An egg beater has a mechanical advantage of what?
With oil - grease or soap.
Opposite.
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.

5. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
Simple machine
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.

6. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.

7. What is the jack screw used for?
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

8. What is one type of second class lever?
Wheel and axle.
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.
Gravity - Magnetism - Friction - Recoil

9. The worm gear is a combination of what?
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.

10. What direction does the effort and resistance move in first class levers?
32/8 = 4
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
Opposite.

11. What is an example of a third class lever?
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
your arm.
Door knob.

12. Gears can do a job for you by changing what three things?
A few thousandths of an inch.
The change of the direction of the pull.
Same.
Direction - speed or size of the force applied.

13. What are first and third class levers used for?
Two surfaces move against one another.
To magnify the applied force.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

14. 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?
Length of ramp/length of height from floor to truck
32/8 = 4
Two surfaces move against one another.
Foot- pounds

15. What kind of mechanical advantage does the first and second class lever provide?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Simple machine
Work=Force*Distance
Positive mechanical advantage.

16. What is the mechanical advantage for a single fixed block?
Positive mechanical advantage.
Can change the direction of motion.
Simple machine
1

17. What is the work formula?
Work=Force*Distance
To magnify the applied force.
Simple machine
Positive mechanical advantage.

18. A miter gear connects what?
In pounds.
Connects shafts having a 90 degree angle.
Wheel and axle.
Third class lever.

19. How can you figure out the mechanical advantage of most block and falls by glance?
Door knob.
Equals the weight of the object being hoisted.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.

20. Work is measured in units also known as?
In Horsepower.
To raise a house or other heavy machinery.
Foot- pounds
With oil - grease or soap.

21. What is the power formula?
In Horsepower.
The change of the direction of the pull.
To speed up the motion of resistence.
Power=Work/Time

22. What is another way to find the mechanical advantage of an inclined plane?
your arm.
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.

23. Class two lever
Two surfaces move against one another.
fulcrum- weight- effort
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.

24. How do you find the mechanical advantage?
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.
The force used to overcome friction is greater than the force used to do useful work.
your arm.

25. What are the 4 forces?
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
In pounds.
Equals the weight of the object being hoisted.

26. What direction does the effort and resistance move in third class levers.
Simple machine
Same.
2(pie)/pitch
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

27. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.

28. What is the second thing a gear can do?
Two surfaces move against one another.
In pounds.
Increase or decrease the the speed of the applied motion.
To magnify the applied force.

29. How do you measure power?
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.
1
In Horsepower.

30. Friction is involved when?
Foot- pounds
Increase or decrease the the speed of the applied motion.
Simple machine
Two surfaces move against one another.

31. What is the purpose of a third class lever?
To speed up the motion of resistence.
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.

32. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
Length of ramp/length of height from floor to truck
Opposite.

33. How is distance measured in work?
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Feet.

34. What type of lever provides a fractional mechanical advantage?
Third class lever.
Positive mechanical advantage.
Opposite.
Increase or decrease the the speed of the applied motion.

35. What kind of machine is the inclined plane?
In Horsepower.
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
Simple machine

36. hat is a screw?
fulcrum- weight- effort
Foot- pounds
To magnify the applied force.
A modification of an inclined plane.

37. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.
Shafts lying at any given angle.
Positive mechanical advantage.

38. What is the theoretical mechanical advantage of any gear train?
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.

39. What direction does the effort and resistance move in the second class levers?
Same.
Length of ramp/length of height from floor to truck
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.

40. The miter gear faces are beveled at what angle?
45
1
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

41. What does a micrometer measure?
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
45
To speed up the motion of resistence.

42. What is the ratio of any gear train?
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

43. How can you decrease friction on flat surfaces?
Power=Work/Time
With oil - grease or soap.
Positive mechanical advantage.
The change of the direction of the pull.

44. 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.
Feet.
Same.

45. The bevel gear is used to connect what?
Positive mechanical advantage.
Same.
Shafts lying at any given angle.
your arm.

46. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The rope that passes through your hands is greater than the distance that the load is raised.
A few thousandths of an inch.
Equals the weight of the object being hoisted.
In Horsepower.

47. What is the lever formula?
Simple machine
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

48. How is force measured in work?
In pounds.
Shafts lying at any given angle.
Same.
Same.

49. What is the formula for the wheel and axle?
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.
Count the number of parts of the rope going to and from the movable block.
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

50. 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.
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
Mechanical disadvantage. Use more force than the force of the load you lift.