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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. How can you figure out the mechanical advantage of most block and falls by glance?
A modification of an inclined plane.
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.
Gravity - Magnetism - Friction - Recoil

2. Work is measured in units also known as?
Foot- pounds
Opposite.
Feet.
In pounds.

3. What is one type of second class lever?
Wheel and axle.
2(pie)/pitch
Work=Force*Distance
Feet.

4. What does a micrometer measure?
32/8 = 4
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.

5. What is the first thing a gear can do?
To magnify the applied force.
Feet.
Can change the direction of motion.
A screw and a spur gear.

6. What direction does the effort and resistance move in the second class levers?
2(pie)/pitch
A modification of an inclined plane.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. What are first and third class levers used for?
To magnify the applied force.
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.
2. Each half of the rope carries an equal amount of weight.

8. How do you find the mechanical advantage?
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 speed up the motion of resistence.
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.

9. Friction is involved when?
Two surfaces move against one another.
With oil - grease or soap.
Can change the direction of motion.
Shafts lying at any given angle.

10. Formula for fractional mechanical disadvantage.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.

11. hat is a screw?
A modification of an inclined plane.
Can change the direction of motion.
Feet.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

12. What is the lever formula?
1
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.
Length of ramp/length of height from floor to truck

13. What is the jack screw used for?
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.
Power=Work/Time
To raise a house or other heavy machinery.

14. Gears can do a job for you by changing what three things?
Can change the direction of motion.
A modification of an inclined plane.
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

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?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
32/8 = 4

16. What is the work formula?
Positive mechanical advantage.
32/8 = 4
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.

17. What is the purpose of a third class lever?
To speed up the motion of resistence.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.

18. A miter gear connects what?
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
Third class lever.
Connects shafts having a 90 degree angle.

19. How can you decrease friction on flat surfaces?
With oil - grease or soap.
2(pie)/pitch
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.

20. What is the formula for the wheel and axle?
The change of the direction of the pull.
Can change the direction of 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
1

21. What is the second thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.

22. What is the mechanical advantage of a single movable block?
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.

23. What is the ratio of any gear train?
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Less than 1.
Count the number of parts of the rope going to and from the movable block.

24. Class two lever
Direction - speed or size of the force applied.
fulcrum- weight- effort
A screw and a spur gear.
Door knob.

25. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Less than 1.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

26. With a single fixed sheave what is the only mechanical advantage?
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.
Shafts lying at any given angle.
The change of the direction of the pull.

27. How is work done?
Less than 1.
In Horsepower.
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.

28. What direction does the effort and resistance move in first class levers?
Opposite.
2. Each half of the rope carries an equal amount of weight.
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

29. The threads of a screw are cut so?
your arm.
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.

30. What is the theoretical mechanical advantage of any gear train?
The change of the direction of the pull.
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 the driven gears/ divided by the product of the number of teeth on the driver gears.
To speed up the motion of resistence.

31. What is the formula for the mechanical advantage of a screw?
Feet.
A modification of an inclined plane.
A few thousandths of an inch.
2(pie)/pitch

32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
With oil - grease or soap.
Third class lever.
Positive mechanical advantage.
Equals the weight of the object being hoisted.

33. The bevel gear is used to connect what?
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Third class lever.

34. What is the power formula?
Power=Work/Time
Magnify or reduce the force which you apply.
Same.
2(pie)/pitch

35. An egg beater has a mechanical advantage of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.
Power=Work/Time
Positive mechanical advantage.

36. What is the mechanical advantage for a single fixed block?
45
1
Simple machine
Positive mechanical advantage.

37. What is another example of a wheel and axle?
Door knob.
Wheel and axle.
In pounds.
A modification of an inclined plane.

38. What kind of mechanical advantage does the first and second class lever provide?
Foot- pounds
Positive mechanical advantage.
A few thousandths of an inch.
A modification of an inclined plane.

39. What type of lever provides a fractional mechanical advantage?
Work=Force*Distance
Shafts lying at any given angle.
Third class lever.
To raise a house or other heavy machinery.

40. What is an example of a third class lever?
your arm.
A screw and a spur gear.
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
Equals the weight of the object being hoisted.

41. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.
Simple machine
Third class lever.

42. The miter gear faces are beveled at what angle?
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
45
Magnify or reduce the force which you apply.

43. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Can change the direction of motion.
Shafts lying at any given angle.

44. What is another way to find the mechanical advantage 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.
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

45. How is force measured in work?
Power=Work/Time
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
In pounds.
Positive mechanical advantage.

46. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
fulcrum- weight- effort
The change of the direction of the pull.
2(pie)/pitch

47. The worm gear is a combination of what?
Same.
Third class lever.
A screw and a spur gear.
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.

48. What kind of machine is the inclined plane?
Simple machine
Positive mechanical advantage.
Same.
To speed up the motion of resistence.

49. How is distance measured in work?
45
Foot- pounds
A modification of an inclined plane.
Feet.

50. How do you measure power?
In Horsepower.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.