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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 mechanical advantage of a screw?
2(pie)/pitch
Simple machine
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.

2. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.
Positive mechanical advantage.

3. What are first and third class levers used for?
1
Shafts lying at any given angle.
fulcrum- weight- effort
To magnify the applied force.

4. What type of lever provides a fractional mechanical advantage?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.
Door knob.

5. What direction does the effort and resistance move in the second class levers?
Same.
A screw and a spur gear.
Increase or decrease the the speed of the applied 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

6. How do you measure power?
Same.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.

7. 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?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
32/8 = 4
A screw and a spur gear.

8. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
To magnify the applied force.
Direction - speed or size of the force applied.
1

9. What is an example of a third class lever?
your arm.
With oil - grease or soap.
A screw and a spur gear.
fulcrum- weight- effort

10. What direction does the effort and resistance move in third class levers.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
Positive mechanical advantage.

11. Gears can do a job for you by changing what three things?
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Direction - speed or size of the force applied.
fulcrum- weight- effort

12. 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.
Foot- pounds
Shafts lying at any given angle.
Work=Force*Distance

13. What is the power formula?
Power=Work/Time
To magnify the applied force.
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

14. How can you figure out the mechanical advantage of most block and falls by glance?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by 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.
Same.

15. What is the lever formula?
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

16. What is one type of second class lever?
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.

17. An egg beater has a mechanical advantage of what?
Less than 1.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.

18. What is another example of a wheel and axle?
In Horsepower.
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
Door knob.

19. What is the formula for the wheel and axle?
When a resistance is overcome by a force acting through a measurable distance.
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
Same.
Less than 1.

20. How do you find the mechanical advantage?
Can change the direction of motion.
With oil - grease or soap.
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.

21. What direction does the effort and resistance move in first class levers?
Opposite.
your arm.
Work=Force*Distance
Two surfaces move against one another.

22. What is the second thing a gear can do?
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.
A few thousandths of an inch.
32/8 = 4

23. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Foot- pounds
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

24. Class two lever
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
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.
A few thousandths of an inch.

25. Friction is involved when?
Two surfaces move against one another.
Power=Work/Time
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.

26. hat is a screw?
Third class lever.
A modification of an 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.
Gravity - Magnetism - Friction - Recoil

27. What is the theoretical mechanical advantage of any gear train?
Less than 1.
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.

28. What is the purpose of a third class lever?
To speed up the motion of resistence.
Power=Work/Time
your arm.
To magnify the applied force.

29. What is the mechanical advantage of a single movable block?
Connects shafts having a 90 degree angle.
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. 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.

30. The bevel gear is used to connect what?
A screw and a spur gear.
Less than 1.
A few thousandths of an inch.
Shafts lying at any given angle.

31. The worm gear is a combination of what?
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.

32. The miter gear faces are beveled at what angle?
Same.
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
45
Connects shafts having a 90 degree angle.

33. Fractional mechanical advantage
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine

34. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
Direction - speed or size of the force applied.

35. What is the first thing a gear can do?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.
Shafts lying at any given angle.

36. What is the ratio of any gear train?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Door knob.
Count the number of parts of the rope going to and from the movable block.

37. What kind of machine is the inclined plane?
Equals the weight of the object being hoisted.
Simple machine
Third class lever.
To magnify the applied force.

38. What kind of mechanical advantage does the first and second class lever provide?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.
Positive mechanical advantage.
The change of the direction of the pull.

39. Formula for fractional mechanical disadvantage.
Simple machine
A few thousandths of an inch.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
To speed up the motion of resistence.

41. What does a micrometer measure?
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.
Less than 1.

42. What is the mechanical advantage for a single fixed block?
1
To speed up the motion of resistence.
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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

44. What is the jack screw used for?
fulcrum- weight- effort
Simple machine
To raise a house or other heavy machinery.
your arm.

45. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.
Feet.

46. A miter gear connects 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.
Same.
45
Connects shafts having a 90 degree angle.

47. What is the work formula?
Door knob.
Work=Force*Distance
A modification of an inclined plane.
32/8 = 4

48. How is work done?
In Horsepower.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.

49. How is force measured in work?
Work=Force*Distance
In pounds.
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.

50. Work is measured in units also known as?
45
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
Foot- pounds