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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 mechanical advantage for a single fixed block?
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
Feet.
1
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.

2. What direction does the effort and resistance move in third class levers.
Same.
Two surfaces move against one another.
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.

3. What is another example of a wheel and axle?
Door knob.
Two surfaces move against one another.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.

4. The miter gear faces are beveled at what angle?
45
The rope that passes through your hands is greater than the distance that the load is raised.
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

5. 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.
Gravity - Magnetism - Friction - Recoil
your arm.

6. How do you measure power?
In Horsepower.
A modification of an inclined plane.
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.

7. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
45
Door knob.
Gravity - Magnetism - Friction - Recoil

8. What is an example of a third class lever?
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
your arm.

9. What is the formula for the mechanical advantage of a screw?
1
Positive mechanical advantage.
Can change the direction of motion.
2(pie)/pitch

10. What is the first thing a gear can do?
A screw and a spur gear.
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
Count the number of parts of the rope going to and from the movable block.

11. How do you find the mechanical advantage?
In pounds.
Direction - speed or size of the force applied.
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.

12. What is another way to find the mechanical advantage of an inclined plane?
Equals the weight of the object being hoisted.
Length of ramp/length of height from floor to truck
A screw and a spur gear.
Third class lever.

13. What does a micrometer measure?
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
With oil - grease or soap.
A few thousandths of an inch.

14. With a single fixed sheave what is the only mechanical advantage?
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
The change of the direction of the pull.

15. How can you figure out the mechanical advantage of most block and falls by glance?
Feet.
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
Foot- pounds

16. What type of lever provides a fractional 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.
Simple machine
In pounds.
Third class lever.

17. How is work done?
1
To raise a house or other heavy machinery.
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.

18. What is the third thing a gear can do?
1
your arm.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.

19. 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.
Door knob.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.

20. A miter gear connects what?
With oil - grease or soap.
Can change the direction of motion.
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.

21. What is the second thing a gear can do?
Door knob.
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
your arm.

22. 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?
Count the number of parts of the rope going to and from the movable block.
32/8 = 4
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

23. Work is measured in units also known as?
2(pie)/pitch
Door knob.
Foot- pounds
45

24. The worm gear is a combination of what?
Simple machine
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
Two surfaces move against one another.

25. Class two lever
fulcrum- weight- effort
A screw and a spur gear.
In pounds.
Length of ramp/length of height from floor to truck

26. What is the ratio of any gear train?
Power=Work/Time
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.
A modification of an inclined plane.

27. What kind of machine is the inclined plane?
Same.
Simple machine
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil

28. 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.
Equals the weight of the object being hoisted.
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.

29. hat is a screw?
Two surfaces move against one another.
A modification of an inclined plane.
Foot- pounds
Simple machine

30. The threads of a screw are cut so?
A few thousandths of an inch.
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.
Connects shafts having a 90 degree angle.

31. What are the 4 forces?
In pounds.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
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.

32. How is distance measured in work?
The force used to overcome friction is greater than the force used to do useful work.
Feet.
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.

33. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45
To magnify the applied force.
A few thousandths of an inch.

34. How is force measured in work?
Count the number of parts of the rope going to and from the movable block.
In pounds.
Direction - speed or size of the force applied.
Feet.

35. Gears can do a job for you by changing what three things?
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.
Less than 1.
Work=Force*Distance

36. What are first and third class levers used for?
Positive mechanical advantage.
Feet.
Third class lever.
To magnify the applied force.

37. What direction does the effort and resistance move in the second class levers?
fulcrum- weight- effort
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.

38. What is the work formula?
Work=Force*Distance
45
Feet.
To speed up the motion of resistence.

39. What is one type of second class lever?
Same.
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.

40. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort

41. The bevel gear is used to connect what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.
Two surfaces move against one another.
A few thousandths of an inch.

42. 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
45
your arm.
1

43. What is the theoretical mechanical advantage of any gear train?
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time
To raise a house or other heavy machinery.

44. What kind of mechanical advantage does the first and second class lever provide?
Third class lever.
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
2(pie)/pitch

45. Friction is involved when?
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.
Two surfaces move against one another.
Simple machine

46. What is the purpose of a third class lever?
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.
Shafts lying at any given angle.
Simple machine

47. What is the power formula?
Opposite.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time

48. What direction does the effort and resistance move in first class levers?
Opposite.
Wheel and axle.
To speed up the motion of resistence.
Gravity - Magnetism - Friction - Recoil

49. An egg beater has a mechanical advantage of what?
1
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.
Less than 1.

50. Fractional mechanical advantage
In Horsepower.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
Mechanical disadvantage. Use more force than the force of the load you lift.