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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. An egg beater has a mechanical advantage of what?
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
Positive mechanical advantage.
To raise a house or other heavy machinery.

2. What direction does the effort and resistance move in first class levers?
Opposite.
2(pie)/pitch
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.

3. What are first and third class levers used for?
Two surfaces move against one another.
To magnify the applied force.
To raise a house or other heavy machinery.
32/8 = 4

4. 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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
Gravity - Magnetism - Friction - Recoil

5. What is the mechanical advantage of a single movable block?
Magnify or reduce the force which you apply.
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
2. Each half of the rope carries an equal amount of weight.

6. How can you figure out the mechanical advantage of most block and falls by glance?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.

7. The bevel gear is used to connect what?
Shafts lying at any given 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.
Length of ramp/length of height from floor to truck
Can change the direction of motion.

8. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

9. What does a micrometer measure?
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.
A few thousandths of an inch.
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

10. How can you decrease friction on flat surfaces?
Equals the weight of the object being hoisted.
Wheel and axle.
your arm.
With oil - grease or soap.

11. Work is measured in units also known as?
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds
To speed up the motion of resistence.

12. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
Work=Force*Distance

13. hat is a screw?
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
A few thousandths of an inch.
Feet.

14. What is the first thing a gear can do?
Can change the direction of motion.
A screw and a spur gear.
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

15. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
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.

16. Gears can do a job for you by changing what three things?
Connects shafts having a 90 degree angle.
2(pie)/pitch
With oil - grease or soap.
Direction - speed or size of the force applied.

17. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

18. What is the power formula?
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.
Same.

19. What is the third 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.
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.
Magnify or reduce the force which you apply.

20. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
Foot- pounds
A few thousandths of an inch.

21. What kind of machine is the inclined plane?
A screw and a spur gear.
Simple machine
Direction - speed or size of the force applied.
In pounds.

22. The worm gear is a combination of what?
Opposite.
A screw and a spur gear.
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.

23. What is the formula for the wheel and axle?
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
Direction - speed or size of the force applied.
The change of the direction of the pull.

24. What are the 4 forces?
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

25. What is the purpose of a third class lever?
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Same.
Count the number of parts of the rope going to and from the movable block.

26. A miter gear connects what?
1
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.
Feet.

27. What is the lever formula?
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.
Shafts lying at any given angle.
Same.

28. What type of lever provides a fractional mechanical advantage?
Magnify or reduce the force which you apply.
Third class lever.
Feet.
Wheel and axle.

29. With a single fixed sheave what is the only mechanical advantage?
Same.
Less than 1.
The change of the direction of the pull.
Simple machine

30. What is the mechanical advantage for a single fixed block?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1

31. What is the theoretical mechanical advantage of any gear train?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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
Door knob.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

32. What is an example of a third class lever?
Connects shafts having a 90 degree angle.
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.
your arm.

33. How is force measured in 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.
In pounds.
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

34. How is work done?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.
Two surfaces move against one another.

35. Class two lever
Positive mechanical advantage.
Can change the direction of motion.
Power=Work/Time
fulcrum- weight- effort

36. How do you measure power?
In Horsepower.
Length of ramp/length of height from floor to truck
With oil - grease or soap.
Positive mechanical advantage.

37. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Wheel and axle.
Work=Force*Distance
Simple machine

38. What is another example of a wheel and axle?
your arm.
Connects shafts having a 90 degree angle.
Door knob.
In pounds.

39. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.
Feet.
Shafts lying at any given angle.

40. What is one type of second class lever?
32/8 = 4
Wheel and axle.
Less than 1.
To raise a house or other heavy machinery.

41. What direction does the effort and resistance move in the second class levers?
Power=Work/Time
Gravity - Magnetism - Friction - Recoil
Same.
45

42. 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.
Positive mechanical advantage.
1
2(pie)/pitch

43. What is the jack screw used for?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Feet.
In Horsepower.

44. What is another way to find the mechanical advantage of an inclined plane?
Door knob.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Length of ramp/length of height from floor to truck
A screw and a spur gear.

45. What is the work formula?
Work=Force*Distance
2(pie)/pitch
Increase or decrease the the speed of the applied motion.
Foot- pounds

46. The miter gear faces are beveled at what 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.
45
Same.
Foot- pounds

47. Friction is involved when?
Foot- pounds
Door knob.
To speed up the motion of resistence.
Two surfaces move against one another.

48. 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.
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.
1
Equals the weight of the object being hoisted.

49. What direction does the effort and resistance move in third class levers.
A modification of an inclined plane.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Positive mechanical advantage.
Same.

50. 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?
Power=Work/Time
Equals the weight of the object being hoisted.
2(pie)/pitch
32/8 = 4