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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.
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
Foot- pounds

2. What is one type of second class lever?
Wheel and axle.
fulcrum- weight- effort
1
Work=Force*Distance

3. What does a micrometer measure?
To raise a house or other heavy machinery.
Feet.
A few thousandths of an inch.
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.

4. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
In Horsepower.
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

5. What are first and third class levers used for?
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.
Work=Force*Distance
Two surfaces move against one another.

6. 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.
Door knob.
2. Each half of the rope carries an equal amount of weight.
Feet.

7. Work is measured in units also known as?
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
Direction - speed or size of the force applied.
Feet.

8. What is another way to find the mechanical advantage of an inclined plane?
Less than 1.
The change of the direction of the pull.
Length of ramp/length of height from floor to truck
A screw and a spur gear.

9. How is distance measured in work?
45
A modification of an inclined plane.
Positive mechanical advantage.
Feet.

10. What is the first thing a gear can do?
Opposite.
Third class lever.
32/8 = 4
Can change the direction of motion.

11. What are the 4 forces?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
Opposite.

12. What is the lever formula?
When a resistance is overcome by a force acting through a measurable distance.
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.
The force used to overcome friction is greater than the force used to do useful work.

13. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
your arm.
With oil - grease or soap.

14. What direction does the effort and resistance move in third class levers.
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
A few thousandths of an inch.
Same.

15. What is the formula for the mechanical advantage of a screw?
The change of the direction of the pull.
2(pie)/pitch
Feet.
Increase or decrease the the speed of the applied motion.

16. What is the work formula?
Work=Force*Distance
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
1

17. What is the ratio 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.
Opposite.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

18. What is an example of a third class lever?
Can change the direction of motion.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

19. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
Connects shafts having a 90 degree angle.
Wheel and axle.
Equals the weight of the object being hoisted.

20. 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?
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
Same.
Feet.

21. hat is a screw?
Third class lever.
Same.
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.

22. What is another example of a wheel and axle?
Two surfaces move against one another.
To raise a house or other heavy machinery.
Door knob.
To magnify the applied force.

23. With a single fixed sheave what is the only mechanical advantage?
Wheel and axle.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.

24. What is the power formula?
32/8 = 4
Magnify or reduce the force which you apply.
In pounds.
Power=Work/Time

25. How is force measured in work?
Positive mechanical advantage.
In pounds.
Less than 1.
fulcrum- weight- effort

26. The miter gear faces are beveled at what angle?
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
45
To magnify the applied force.

27. Gears can do a job for you by changing what three things?
A screw and a spur gear.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.

28. How do you find the mechanical advantage?
Same.
Magnify or reduce the force which you apply.
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.

29. What type of lever provides a fractional mechanical advantage?
Third class lever.
Foot- pounds
2(pie)/pitch
Same.

30. What is the jack screw used for?
In Horsepower.
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

31. What is the purpose of a third class lever?
Feet.
fulcrum- weight- effort
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.

32. What direction does the effort and resistance move in the second class levers?
Foot- pounds
Same.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.

33. Friction is involved when?
32/8 = 4
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.
Two surfaces move against one another.

34. What direction does the effort and resistance move in first class levers?
To raise a house or other heavy machinery.
Opposite.
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck

35. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
Simple machine
Wheel and axle.
your arm.

36. What is the formula for the wheel and axle?
Two surfaces move against one another.
1
Simple machine
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

37. A miter gear connects what?
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck
Count the number of parts of the rope going to and from the movable block.
Direction - speed or size of the force applied.

38. Class two lever
Positive mechanical advantage.
Magnify or reduce the force which you apply.
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.
fulcrum- weight- effort

39. What kind of machine is the inclined plane?
Simple machine
Less than 1.
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.

40. What is the mechanical advantage of a single movable block?
Work=Force*Distance
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.
Door knob.

41. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.

42. Fractional mechanical advantage
Third class lever.
Less than 1.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

43. How do you measure power?
The change of the direction of the pull.
With oil - grease or soap.
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.

44. 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.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
45

45. The worm gear is a combination of what?
Shafts lying at any given angle.
Same.
A screw and a spur gear.
To magnify the applied force.

46. Formula for fractional mechanical disadvantage.
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
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

47. How can you decrease friction on flat surfaces?
To magnify the applied force.
With oil - grease or soap.
The change of the direction of the pull.
Power=Work/Time

48. What is the mechanical advantage for a single fixed block?
Simple machine
Shafts lying at any given angle.
1
A few thousandths of an inch.

49. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Wheel and axle.
45
Simple machine

50. The bevel gear is used to connect what?
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Shafts lying at any given angle.