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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 another example of a wheel and axle?
Same.
Door knob.
Two surfaces move against one another.
Can change the direction of motion.

2. What kind of machine is the 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
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Simple machine

3. A miter gear connects what?
A screw and a spur gear.
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Equals the weight of the object being hoisted.

4. How is force measured in work?
In pounds.
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.

5. How do you measure power?
32/8 = 4
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
In Horsepower.

6. What is another way to find the mechanical advantage of an inclined plane?
Wheel and axle.
Length of ramp/length of height from floor to truck
your arm.
Foot- pounds

7. What direction does the effort and resistance move in the second class levers?
To magnify the applied force.
Same.
32/8 = 4
Power=Work/Time

8. 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?
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
Wheel and axle.

9. What is the first thing a gear can do?
Can change the direction of motion.
1
Simple machine
To raise a house or other heavy machinery.

10. What is the purpose of a third class lever?
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
Same.

11. How can you decrease friction on flat surfaces?
In Horsepower.
With oil - grease or soap.
Same.
Simple machine

12. How can you figure out the mechanical advantage of most block and falls by glance?
Positive mechanical advantage.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.

13. Friction is involved when?
Simple machine
Foot- pounds
Two surfaces move against one another.
Positive mechanical advantage.

14. How is work done?
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

15. What type of lever provides a fractional mechanical advantage?
Third class lever.
Same.
your arm.
Feet.

16. What is one type of second class lever?
Can change the direction of motion.
Wheel and axle.
Shafts lying at any given angle.
Same.

17. What is the second thing a gear can do?
Magnify or reduce the force which you apply.
A few thousandths of an inch.
In Horsepower.
Increase or decrease the the speed of the applied motion.

18. What direction does the effort and resistance move in third class levers.
45
Length of ramp/length of height from floor to truck
Same.
Feet.

19. 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.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine

20. What is the third thing a gear can do?
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(pie)/pitch
Two surfaces move against one another.
Magnify or reduce the force which you apply.

21. An egg beater has a mechanical advantage of what?
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
In Horsepower.

22. What is the mechanical advantage for a single fixed 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
1
The force used to overcome friction is greater than the force used to do useful work.
Count the number of parts of the rope going to and from the movable block.

23. What direction does the effort and resistance move in first class levers?
A few thousandths of an inch.
2(pie)/pitch
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

24. What is the lever formula?
45
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.
Connects shafts having a 90 degree angle.

25. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.

26. hat is a screw?
A modification of an inclined plane.
Door knob.
Simple machine
Less than 1.

27. What is the formula for the mechanical advantage of a screw?
In Horsepower.
Simple machine
Foot- pounds
2(pie)/pitch

28. The threads of a screw are cut so?
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
The force used to overcome friction is greater than the force used to do useful work.
Same.

29. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Door knob.
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 rope that passes through your hands is greater than the distance that the load is raised.

30. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil
Foot- pounds

31. What is the work formula?
Shafts lying at any given angle.
Positive mechanical advantage.
1
Work=Force*Distance

32. Gears can do a job for you by changing what three things?
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.
1
Direction - speed or size of the force applied.

33. 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.
Less than 1.
Foot- pounds
To raise a house or other heavy machinery.

34. 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
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.
your arm.

35. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.

36. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A screw and a spur gear.

37. What is the ratio of any gear train?
Connects shafts having a 90 degree angle.
45
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

38. Class two lever
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.

39. Formula for fractional mechanical disadvantage.
To speed up the motion of resistence.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.

40. What is the mechanical advantage of a single movable block?
Magnify or reduce the force which you apply.
Work=Force*Distance
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.

41. How is distance measured in work?
Same.
Direction - speed or size of the force applied.
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
Feet.

42. What is the power formula?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
Power=Work/Time
Simple machine

43. How do you find the mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

44. The worm gear is a combination of what?
With oil - grease or soap.
your arm.
A screw and a spur gear.
fulcrum- weight- effort

45. What does a micrometer measure?
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
With oil - grease or soap.
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

46. The miter gear faces are beveled at what angle?
Power=Work/Time
Two surfaces move against one another.
45
Same.

47. What is an example of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
your arm.
1

48. The bevel gear is used to connect what?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
In pounds.
Shafts lying at any given angle.
2(pie)/pitch

49. What kind of mechanical advantage does the first and second class lever provide?
Less than 1.
Same.
Opposite.
Positive mechanical advantage.

50. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
In Horsepower.
Feet.
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.