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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 third thing a gear can do?
Third class lever.
Magnify or reduce the force which you apply.
32/8 = 4
Equals the weight of the object being hoisted.

2. What kind of machine is the inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
Two surfaces move against one another.
Same.
Simple machine

3. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Magnify or reduce the force which you apply.
32/8 = 4
A screw and a spur gear.

4. What is an example of a third class lever?
Positive mechanical advantage.
Foot- pounds
your arm.
Opposite.

5. What is the theoretical mechanical advantage of any gear train?
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.

6. How can you figure out the mechanical advantage of most block and falls by glance?
Wheel and axle.
fulcrum- weight- effort
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.

7. How do you measure power?
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
Work=Force*Distance
fulcrum- weight- effort

8. What direction does the effort and resistance move in third class levers.
Less than 1.
To raise a house or other heavy machinery.
Same.
Wheel and axle.

9. The worm gear is a combination of what?
Foot- pounds
A screw and a spur gear.
A modification 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

10. With a single fixed sheave what is the only mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
To speed up the motion of resistence.
Third class lever.

11. What is the purpose of a third class lever?
Can change the direction of motion.
In Horsepower.
To speed up the motion of resistence.
32/8 = 4

12. What is the ratio of any gear train?
To magnify the applied force.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

13. How is force measured in work?
In pounds.
Less than 1.
45
1

14. The threads of a screw are cut so?
Feet.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
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

15. What direction does the effort and resistance move in the second class levers?
Direction - speed or size of the force applied.
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.
45

16. A miter gear connects what?
Can change the direction of motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Connects shafts having a 90 degree angle.
Wheel and axle.

17. Formula for fractional mechanical disadvantage.
In Horsepower.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch
Connects shafts having a 90 degree angle.

18. What is another example of a wheel and axle?
Third class lever.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.
Door knob.

19. What is the mechanical advantage of a single movable block?
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.
your arm.
Shafts lying at any given angle.

20. What is the first thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
Can change the direction of motion.
A screw and a spur gear.

21. What are first and third class levers used for?
Less than 1.
your arm.
Shafts lying at any given angle.
To magnify the applied force.

22. What is another way to find the mechanical advantage of an inclined plane?
Simple machine
Length of ramp/length of height from floor to truck
Wheel and axle.
In Horsepower.

23. How do you find the mechanical advantage?
Shafts lying at any given angle.
To magnify the applied force.
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.

24. What is the mechanical advantage for a single fixed block?
1
Power=Work/Time
Magnify or reduce the force which you apply.
To speed up the motion of resistence.

25. What direction does the effort and resistance move in first class levers?
The change of the direction of the pull.
Opposite.
Can change the direction of motion.
With oil - grease or soap.

26. How is work done?
With oil - grease or soap.
Same.
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.

27. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Wheel and axle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance
Equals the weight of the object being hoisted.

28. 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?
Can change the direction of motion.
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
32/8 = 4

29. What is one type of second class lever?
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
fulcrum- weight- effort

30. Fractional mechanical advantage
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
32/8 = 4
Foot- pounds

31. What are the 4 forces?
fulcrum- weight- effort
Feet.
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.

32. What does a micrometer measure?
A few thousandths of an inch.
Power=Work/Time
Wheel and axle.
To raise a house or other heavy machinery.

33. How can you decrease friction on flat surfaces?
1
To magnify the applied force.
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.

34. Class two lever
2. Each half of the rope carries an equal amount of weight.
Feet.
Less than 1.
fulcrum- weight- effort

35. The miter gear faces are beveled at what angle?
With oil - grease or soap.
45
2(pie)/pitch
The change of the direction of the pull.

36. What kind of mechanical advantage does the first and second class lever provide?
Door knob.
Work=Force*Distance
Positive mechanical advantage.
In Horsepower.

37. An egg beater has a mechanical advantage of what?
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
Less than 1.
Simple machine
In pounds.

38. The bevel gear is used to connect what?
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Increase or decrease the the speed of the applied motion.

39. Work is measured in units also known as?
Gravity - Magnetism - Friction - Recoil
Third class lever.
Foot- pounds
A few thousandths of an inch.

40. What is the formula for the wheel and axle?
Can change the direction of motion.
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
32/8 = 4
A screw and a spur gear.

41. 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.
In pounds.
Direction - speed or size of the force applied.
Less than 1.

42. Friction is involved when?
Magnify or reduce the force which you apply.
Positive mechanical advantage.
To magnify the applied force.
Two surfaces move against one another.

43. What is the work formula?
Wheel and axle.
Same.
Work=Force*Distance
32/8 = 4

44. 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.
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.

45. hat is a screw?
Foot- pounds
A modification of an inclined plane.
Opposite.
Third class lever.

46. What is the second thing a gear can do?
Door knob.
To raise a house or other heavy machinery.
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.

47. What is the power formula?
In pounds.
To magnify the applied force.
Length of ramp/length of height from floor to truck
Power=Work/Time

48. What type of lever provides a fractional mechanical advantage?
Third class lever.
In pounds.
fulcrum- weight- effort
Wheel and axle.

49. How is distance measured in work?
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
Feet.
Magnify or reduce the force which you apply.

50. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.