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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. Friction is involved when?
In Horsepower.
Two surfaces move against one another.
Positive mechanical advantage.
Door knob.

2. What is an example of a third class lever?
your arm.
2(pie)/pitch
Can change the direction of motion.
Door knob.

3. How is work done?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
When a resistance is overcome by a force acting through a measurable distance.

4. What does a micrometer measure?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort
A few thousandths of an inch.
The change of the direction of the pull.

5. The bevel gear is used to connect what?
To magnify the applied force.
Shafts lying at any given angle.
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.

6. What is the power formula?
Direction - speed or size of the force applied.
Work=Force*Distance
A few thousandths of an inch.
Power=Work/Time

7. A miter gear connects what?
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.
Foot- pounds
Connects shafts having a 90 degree angle.

8. What is the third thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
Feet.
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.
Magnify or reduce the force which you apply.

9. How can you figure out the mechanical advantage of most block and falls by glance?
45
In Horsepower.
Less than 1.
Count the number of parts of the rope going to and from the movable block.

10. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.
32/8 = 4
A modification of an inclined plane.

11. What is another example of a wheel and axle?
Door knob.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.

12. What is the purpose of a third class lever?
To speed up the motion of resistence.
Same.
Connects shafts having a 90 degree angle.
Feet.

13. 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.
1
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.

14. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.
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.

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
In Horsepower.
Work=Force*Distance
32/8 = 4

16. 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
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
1

17. What is the work formula?
Work=Force*Distance
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
Third class lever.

18. hat is a screw?
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
To magnify the applied force.
A modification of an inclined plane.

19. Work is measured in units also known as?
Foot- pounds
Increase or decrease the the speed of the applied motion.
Same.
2. Each half of the rope carries an equal amount of weight.

20. What kind of machine is the inclined plane?
Positive mechanical advantage.
32/8 = 4
fulcrum- weight- effort
Simple machine

21. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time

22. What is the first 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.
Two surfaces move against one another.
your arm.
Can change the direction of motion.

23. What is one type of second class lever?
Opposite.
Door knob.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.

24. Fractional mechanical advantage
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Mechanical disadvantage. Use more force than the force of the load you lift.

25. What is the formula for the mechanical advantage of a screw?
Less than 1.
2(pie)/pitch
Door knob.
In pounds.

26. What are the 4 forces?
Opposite.
Feet.
Gravity - Magnetism - Friction - Recoil
Same.

27. What direction does the effort and resistance move in first class levers?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Gravity - Magnetism - Friction - Recoil
Same.
Opposite.

28. How can you decrease friction on flat surfaces?
Can change the direction of motion.
In Horsepower.
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.

29. What is the jack screw used for?
fulcrum- weight- effort
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.
Less than 1.

30. How is force measured in work?
In pounds.
Direction - speed or size of the force applied.
To speed up the motion of resistence.
fulcrum- weight- effort

31. What kind of mechanical advantage does the first and second class lever provide?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.

32. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
Mechanical disadvantage. Use more force than the force of the load you lift.
1

33. Class two lever
Increase or decrease the the speed of the applied motion.
Work=Force*Distance
45
fulcrum- weight- effort

34. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
With oil - grease or soap.
Equals the weight of the object being hoisted.
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.

35. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.

36. What are first and third class levers used for?
32/8 = 4
45
Equals the weight of the object being hoisted.
To magnify the applied force.

37. What direction does the effort and resistance move in the second class levers?
In Horsepower.
A modification of an inclined plane.
Same.
fulcrum- weight- effort

38. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Door knob.
32/8 = 4
45

39. The miter gear faces are beveled at what angle?
45
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.
Work=Force*Distance

40. What direction does the effort and resistance move in third class levers.
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.
Same.
Length of ramp/length of height from floor to truck

41. How do you find the mechanical advantage?
Increase or decrease the the speed of the applied 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.
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.

42. What is the ratio of any gear train?
1
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 rope that passes through your hands is greater than the distance that the load is raised.
Simple machine

43. Formula for fractional mechanical disadvantage.
32/8 = 4
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

44. An egg beater has a mechanical advantage of what?
To magnify the applied force.
In Horsepower.
Less than 1.
Increase or decrease the the speed of the applied motion.

45. How is distance measured in work?
Can change the direction of motion.
Feet.
Shafts lying at any given angle.
Same.

46. How do you measure power?
In Horsepower.
Simple machine
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.

47. What type of lever provides a fractional mechanical advantage?
Equals the weight of the object being hoisted.
Can change the direction of motion.
To speed up the motion of resistence.
Third class lever.

48. What is another way to find the mechanical advantage of an inclined plane?
Can change the direction of motion.
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.

49. The worm gear is a combination of what?
A screw and a spur gear.
Door knob.
Shafts lying at any given angle.
2(pie)/pitch

50. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
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.
A screw and a spur gear.