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

2. The bevel gear is used to connect what?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Shafts lying at any given angle.
A screw and a spur gear.
Length of ramp/length of height from floor to truck

3. What is the power formula?
Increase or decrease the the speed of the applied motion.
In pounds.
Opposite.
Power=Work/Time

4. What is the theoretical mechanical advantage of any gear train?
A few thousandths of an inch.
To speed up the motion of resistence.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.

5. What direction does the effort and resistance move in third class levers.
Gravity - Magnetism - Friction - Recoil
1
A modification of an inclined plane.
Same.

6. What is the mechanical advantage of a single 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
2. Each half of the rope carries an equal amount of weight.
Less than 1.
Magnify or reduce the force which you apply.

7. What is the work formula?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
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.

8. The worm gear is a combination of what?
With oil - grease or soap.
A screw and a spur gear.
Opposite.
Wheel and axle.

9. What is the jack screw used for?
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
To raise a house or other heavy machinery.
A modification of an inclined plane.

10. What is the purpose of a third class lever?
To speed up the motion of resistence.
Positive mechanical advantage.
45
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

11. What are the 4 forces?
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Simple machine

12. What is another example of a wheel and axle?
Same.
Feet.
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

13. An egg beater has a mechanical advantage of what?
The change of the direction of the pull.
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1

14. The miter gear faces are beveled at what angle?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.
1
45

15. How is work done?
Door knob.
Can change the direction of motion.
Same.
When a resistance is overcome by a force acting through a measurable distance.

16. hat is a screw?
Connects shafts having a 90 degree angle.
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.

17. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.
The rope that passes through your hands is greater than the distance that the load is raised.

18. What is the first thing a gear can do?
Opposite.
Can change the direction of motion.
2(pie)/pitch
Wheel and axle.

19. What is the ratio of any gear train?
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.

20. What kind of mechanical advantage does the first and second class lever provide?
To magnify the applied force.
32/8 = 4
Third class lever.
Positive mechanical advantage.

21. How is distance measured in work?
To magnify the applied force.
Work=Force*Distance
Feet.
Third class lever.

22. Formula for fractional mechanical disadvantage.
To raise a house or other heavy machinery.
45
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

23. What is the lever formula?
Third class lever.
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

24. What type of lever provides a fractional mechanical advantage?
Positive mechanical advantage.
Third class lever.
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.

25. How is force measured in work?
In Horsepower.
In pounds.
Third class lever.
To magnify the applied force.

26. A miter gear connects what?
1
Power=Work/Time
32/8 = 4
Connects shafts having a 90 degree angle.

27. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.

28. With a single fixed sheave what is the only mechanical advantage?
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
The change of the direction of the pull.
Power=Work/Time

29. 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.
Positive mechanical advantage.
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

30. 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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.

31. What is the second thing a gear can do?
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.
2(pie)/pitch
45
Increase or decrease the the speed of the applied motion.

32. What direction does the effort and resistance move in first 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.
Opposite.
1
Work=Force*Distance

33. What are first and third class levers used for?
To speed up the motion of resistence.
Two surfaces move against one another.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.

34. How do you measure power?
In Horsepower.
Shafts lying at any given angle.
Direction - speed or size of the force applied.
To speed up the motion of resistence.

35. Work is measured in units also known as?
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.
Connects shafts having a 90 degree angle.
Foot- pounds

36. What is another way to find the mechanical advantage of an inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

37. What direction does the effort and resistance move in the second class levers?
Equals the weight of the object being hoisted.
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

38. Class two lever
fulcrum- weight- effort
Two surfaces move against one another.
Wheel and axle.
Connects shafts having a 90 degree angle.

39. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
In pounds.
Length of ramp/length of height from floor to truck
Less than 1.

40. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Door knob.
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

41. 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?
To magnify the applied force.
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
32/8 = 4

42. What is one type of second class lever?
Wheel and axle.
your arm.
Opposite.
Magnify or reduce the force which you apply.

43. What is the mechanical advantage for a single fixed block?
Simple machine
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.
1

44. What does a micrometer measure?
Less than 1.
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
A few thousandths of an inch.
Door knob.

45. The threads of a screw are cut so?
The change of the direction of the pull.
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.
Length of ramp/length of height from floor to truck

46. How can you decrease friction on flat surfaces?
Work=Force*Distance
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
In pounds.

47. What is an example of a third class lever?
Two surfaces move against one another.
1
your arm.
Door knob.

48. What kind of machine is the inclined plane?
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort
Simple machine

49. What is the formula for the wheel and axle?
Third class lever.
32/8 = 4
Positive mechanical advantage.
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. What is the third thing a gear can do?
Same.
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance