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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 another way to find the mechanical advantage of an inclined plane?
Opposite.
In Horsepower.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

2. What type of lever provides a fractional mechanical advantage?
A screw and a spur gear.
Direction - speed or size of the force applied.
Third class lever.
Power=Work/Time

3. How is force measured in work?
The change of the direction of the pull.
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.
In pounds.
Shafts lying at any given angle.

4. Friction is involved when?
Two surfaces move against one another.
Simple machine
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.

5. What are first and third class levers used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
To magnify the applied force.
1

6. What is the mechanical advantage for a single fixed block?
45
Can change the direction of motion.
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

7. How is distance measured in work?
Positive mechanical advantage.
your arm.
Feet.
Increase or decrease the the speed of the applied motion.

8. Class two lever
Opposite.
2(pie)/pitch
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.

9. An egg beater has a mechanical advantage of what?
Less than 1.
Feet.
Simple machine
Direction - speed or size of the force applied.

10. What is the first thing a gear can do?
A screw and a spur gear.
Can change the direction of motion.
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

11. What is the power formula?
Less than 1.
Shafts lying at any given angle.
Power=Work/Time
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

12. What is an example of a third class lever?
Can change the direction of motion.
A few thousandths of an inch.
To raise a house or other heavy machinery.
your arm.

13. What is one type of second class lever?
To speed up the motion of resistence.
To magnify the applied force.
Simple machine
Wheel and axle.

14. The bevel gear is used to connect what?
Two surfaces move against one another.
Shafts lying at any given angle.
Foot- pounds
Can change the direction of motion.

15. 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.
Direction - speed or size of the force applied.
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.

16. What is the third thing a gear can do?
Wheel and axle.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
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.

17. What is the formula for the 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
Same.
The force used to overcome friction is greater than the force used to do useful work.
Count the number of parts of the rope going to and from the movable block.

18. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

19. What is the work formula?
Work=Force*Distance
Wheel and axle.
A screw and a spur gear.
To magnify the applied force.

20. The miter gear faces are beveled at what angle?
45
Positive mechanical advantage.
Direction - speed or size of the force applied.
Less than 1.

21. What is the jack screw used for?
To raise a house or other heavy machinery.
With oil - grease or soap.
Opposite.
Connects shafts having a 90 degree angle.

22. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Same.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

23. Work is measured in units also known as?
Work=Force*Distance
Foot- pounds
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. What does a micrometer measure?
Simple machine
A few thousandths of an inch.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.

25. What direction does the effort and resistance move in the second class levers?
Feet.
Same.
Equals the weight of the object being hoisted.
Simple machine

26. How can you figure out the mechanical advantage of most block and falls by glance?
To magnify the applied force.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
Simple machine

27. How do you find the mechanical advantage?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
When a resistance is overcome by a force acting through a measurable distance.
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

28. What is the theoretical mechanical advantage of any gear train?
Opposite.
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
45

29. The threads of a screw are cut so?
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.
Gravity - Magnetism - Friction - Recoil
Less than 1.

30. What direction does the effort and resistance move in third class levers.
Same.
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.
A few thousandths of an inch.

31. hat is a screw?
Magnify or reduce the force which you apply.
Third class lever.
A modification of an inclined plane.
Power=Work/Time

32. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
To magnify the applied force.

33. 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.
Increase or decrease the the speed of the applied motion.
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

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

35. 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.
32/8 = 4
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.

36. With a single fixed sheave what is the only mechanical advantage?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.

37. What direction does the effort and resistance move in first class levers?
Direction - speed or size of the force applied.
Opposite.
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.

38. What is the lever formula?
Count the number of parts of the rope going to and from the movable block.
Shafts lying at any given angle.
The rope that passes through your hands is greater than the distance that the load is raised.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

39. How do you measure power?
Magnify or reduce the force which you apply.
In Horsepower.
1
A few thousandths of an inch.

40. 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?
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
A few thousandths of an inch.
32/8 = 4

41. A miter gear connects what?
Same.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.

42. What is the purpose of a third class lever?
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
Power=Work/Time
Increase or decrease the the speed of the applied motion.

43. What is another example of a wheel and axle?
Simple machine
Door knob.
In Horsepower.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

44. What kind of machine is the inclined plane?
Less than 1.
Simple machine
Equals the weight of the object being hoisted.
1

45. What kind of mechanical advantage does the first and second class lever provide?
fulcrum- weight- effort
Third class lever.
Positive mechanical advantage.
To speed up the motion of resistence.

46. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.

47. Fractional 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
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.

48. The worm gear is a combination of what?
Feet.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A screw and a spur gear.
45

49. How is work done?
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
Same.
Work=Force*Distance

50. What is the formula for the mechanical advantage of a screw?
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.