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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. What is the formula for the wheel and axle?
To speed up the motion of resistence.
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.
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
Wheel and axle.

2. What is the mechanical advantage of a single movable block?
Simple machine
45
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.

3. What is the theoretical mechanical advantage of any gear train?
In pounds.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

4. Friction is involved when?
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 speed up the motion of resistence.
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.

5. What direction does the effort and resistance move in third class levers.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
Same.

6. What is the work formula?
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.
Opposite.
Gravity - Magnetism - Friction - Recoil

7. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.
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.

8. How can you figure out the mechanical advantage of most block and falls by glance?
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.

9. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Less than 1.
A screw and a spur gear.
Feet.

10. How is force measured in work?
In Horsepower.
In pounds.
Third class lever.
Two surfaces move against one another.

11. What are the 4 forces?
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.

12. What is the second thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
1
Increase or decrease the the speed of the applied motion.
Magnify or reduce the force which you apply.

13. What are first and third class levers used for?
To magnify the applied force.
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds

14. How is distance measured in work?
32/8 = 4
Feet.
Opposite.
Count the number of parts of the rope going to and from the movable block.

15. 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?
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Length of ramp/length of height from floor to truck
1

16. An egg beater has a mechanical advantage of what?
To raise a house or other heavy machinery.
Less than 1.
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.

17. What is the lever formula?
Count the number of parts of the rope going to and from the movable block.
1
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

18. What is the formula for the mechanical advantage of a screw?
To raise a house or other heavy machinery.
2(pie)/pitch
Opposite.
1

19. What is an example of a third class lever?
your arm.
A screw and a spur gear.
Less than 1.
1

20. What is another example of a wheel and axle?
32/8 = 4
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.

21. How do you find the 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.
Power=Work/Time
Work=Force*Distance
Increase or decrease the the speed of the applied motion.

22. The bevel gear is used to connect what?
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

23. The threads of a screw are cut so?
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time

24. What direction does the effort and resistance move in first class levers?
Simple machine
Count the number of parts of the rope going to and from the movable block.
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.

25. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Equals the weight of the object being hoisted.
1
fulcrum- weight- effort

26. The worm gear is a combination of what?
A screw and a spur gear.
Length of ramp/length of height from floor to truck
1
To raise a house or other heavy machinery.

27. What is the purpose of a third class lever?
your arm.
In Horsepower.
Same.
To speed up the motion of resistence.

28. Work is measured in units also known as?
Foot- pounds
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.

29. 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.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.
Same.

30. What kind of machine is the inclined plane?
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
fulcrum- weight- effort
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

31. 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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.

32. A miter gear connects what?
Connects shafts having a 90 degree angle.
Wheel and axle.
45
32/8 = 4

33. What is the first thing a gear can do?
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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.

34. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
1
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.

35. How do you measure power?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
In Horsepower.

36. What does a micrometer measure?
45
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
A few thousandths of an inch.

37. Formula for fractional mechanical disadvantage.
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.
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.

38. Gears can do a job for you by changing what three things?
To magnify the applied force.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.

39. What is the power formula?
Work=Force*Distance
1
Power=Work/Time
Magnify or reduce the force which you apply.

40. Class two lever
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.

41. Fractional mechanical advantage
In Horsepower.
Two surfaces move against one another.
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.

42. What is the jack screw used for?
To raise a house or other heavy machinery.
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
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.

43. What is the mechanical advantage for a single fixed block?
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
1
Simple machine

44. How is work done?
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
Feet.

45. How can you decrease friction on flat surfaces?
A few thousandths of an inch.
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
your arm.

46. What type of lever provides a fractional mechanical advantage?
Connects shafts having a 90 degree angle.
Third class lever.
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

47. The miter gear faces are beveled at what 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.
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.

48. With a single fixed sheave what is the only mechanical advantage?
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.
The change of the direction of the pull.
Length of ramp/length of height from floor to truck

49. hat is a screw?
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
fulcrum- weight- effort

50. What is one type of second class lever?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Wheel and axle.
Magnify or reduce the force which you apply.