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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 first thing a gear can do?
Can change the direction of motion.
Shafts lying at any given angle.
Work=Force*Distance
Equals the weight of the object being hoisted.

2. What is an example of a third class lever?
your arm.
In Horsepower.
Magnify or reduce the force which you apply.
Can change the direction of motion.

3. What is another example of a wheel and axle?
45
Door knob.
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.

4. What type of lever provides a fractional mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

5. What is the second thing a gear can do?
With oil - grease or soap.
Power=Work/Time
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.

6. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
fulcrum- weight- effort
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.

7. The miter gear faces are beveled at what angle?
The change of the direction of the pull.
45
Foot- pounds
Work=Force*Distance

8. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Same.
fulcrum- weight- effort
A few thousandths of an inch.

9. What are the 4 forces?
2. Each half of the rope carries an equal amount of weight.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
Wheel and axle.

10. Class two lever
Third class lever.
fulcrum- weight- effort
1
Count the number of parts of the rope going to and from the movable block.

11. What is another way to find the mechanical advantage of an inclined plane?
Increase or decrease the the speed of the applied motion.
Less than 1.
Power=Work/Time
Length of ramp/length of height from floor to truck

12. How can you decrease friction on flat surfaces?
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Length of ramp/length of height from floor to truck
Two surfaces move against one another.

13. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
To magnify the applied force.

14. A miter gear connects what?
your arm.
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
Connects shafts having a 90 degree angle.

15. How do you measure power?
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.
Foot- pounds
In Horsepower.

16. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Third class lever.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.

17. Work is measured in units also known as?
Positive mechanical advantage.
Foot- pounds
Opposite.
45

18. Formula for fractional mechanical disadvantage.
Connects shafts having a 90 degree angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.

19. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
A modification of an inclined plane.
Same.

20. What is the work formula?
The change of the direction of the pull.
1
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.

21. What is the formula for the wheel and axle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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
Length of ramp/length of height from floor to truck
Wheel and axle.

22. The bevel gear is used to connect what?
Same.
Positive mechanical advantage.
45
Shafts lying at any given angle.

23. hat is a screw?
A few thousandths of an inch.
A modification of an inclined plane.
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.

24. What direction does the effort and resistance move in third class levers.
Same.
Shafts lying at any given angle.
The change of the direction of the pull.
Equals the weight of the object being hoisted.

25. What is the purpose of a third class lever?
Door knob.
Mechanical disadvantage. Use more force than the force of the load you lift.
32/8 = 4
To speed up the motion of resistence.

26. With a single fixed sheave what is the only mechanical advantage?
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort
The change of the direction of the pull.

27. What is the third thing a gear can do?
Less than 1.
Door knob.
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.

28. How can you figure out the mechanical advantage of most block and falls by glance?
Connects shafts having a 90 degree angle.
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
45

29. What direction does the effort and resistance move in first class levers?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

30. How is force measured in work?
In pounds.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
To magnify the applied force.

31. 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.
The force used to overcome friction is greater than the force used to do useful work.
Opposite.
Third class lever.

32. What kind of machine is the inclined plane?
Simple machine
Work=Force*Distance
Length of ramp/length of height from floor to truck
To magnify the applied force.

33. What is one type of second class lever?
Wheel and axle.
32/8 = 4
45
Opposite.

34. What kind of mechanical advantage does the first and second class lever provide?
Increase or decrease the the speed of the applied motion.
Feet.
32/8 = 4
Positive mechanical advantage.

35. What is the mechanical advantage for a single fixed block?
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
1
In pounds.

36. The worm gear is a combination of what?
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.
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

37. 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?
Work=Force*Distance
Direction - speed or size of the force applied.
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
32/8 = 4

38. Friction is involved when?
In Horsepower.
Positive mechanical advantage.
Two surfaces move against one another.
Can change the direction of motion.

39. An egg beater has a mechanical advantage of what?
Shafts lying at any given angle.
45
Less than 1.
In pounds.

40. What is the theoretical mechanical advantage of any gear train?
Foot- pounds
Wheel and axle.
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.

41. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.

42. What is the jack screw used for?
Same.
Two surfaces move against one another.
Power=Work/Time
To raise a house or other heavy machinery.

43. How do you find the mechanical advantage?
Can change the direction of motion.
Positive mechanical advantage.
Same.
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.

44. How is distance measured in work?
Feet.
When a resistance is overcome by a force acting through a measurable distance.
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.

45. What direction does the effort and resistance move in the second class levers?
The force used to overcome friction is greater than the force used to do useful work.
Same.
In Horsepower.
Less than 1.

46. What is the power formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
Work=Force*Distance

47. What are first and third class levers used for?
Door knob.
To magnify the applied force.
1
Power=Work/Time

48. What is the lever formula?
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 screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.

49. What does a micrometer measure?
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.
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.

50. What is the formula for the mechanical advantage of a screw?
32/8 = 4
2(pie)/pitch
To speed up the motion of resistence.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.