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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. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
In Horsepower.
Equals the weight of the object being hoisted.
Less than 1.
Count the number of parts of the rope going to and from the movable block.

2. What kind of mechanical advantage does the first and second class lever provide?
Door knob.
Two surfaces move against one another.
Positive mechanical advantage.
2(pie)/pitch

3. Formula for fractional mechanical disadvantage.
Equals the weight of the object being hoisted.
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.
Foot- pounds

4. Friction is involved when?
Opposite.
Two surfaces move against one another.
Door knob.
your arm.

5. How is force measured in work?
Feet.
In pounds.
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil

6. What direction does the effort and resistance move in third class levers.
Same.
With oil - grease or soap.
A modification of an inclined plane.
Length of ramp/length of height from floor to truck

7. What direction does the effort and resistance move in the second class levers?
your arm.
Third class lever.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

8. The miter gear faces are beveled at what angle?
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
45
The rope that passes through your hands is greater than the distance that the load is raised.

9. Class two lever
2(pie)/pitch
Two surfaces move against one another.
Less than 1.
fulcrum- weight- effort

10. hat is a screw?
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.
A modification of an inclined plane.
Wheel and axle.

11. What is one type of second class lever?
Wheel and axle.
1
In pounds.
Direction - speed or size of the force applied.

12. What are the 4 forces?
Simple machine
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
Foot- pounds

13. What is the purpose of a third class lever?
A modification of an inclined plane.
To speed up the motion of resistence.
To magnify the applied force.
Power=Work/Time

14. How is work done?
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
In Horsepower.
To raise a house or other heavy machinery.

15. What is the ratio of any gear train?
With oil - grease or soap.
Magnify or reduce the force which you apply.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

16. What is the formula for the wheel and axle?
45
When a resistance is overcome by a force acting through a measurable distance.
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
1

17. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Power=Work/Time
your arm.
Less than 1.

18. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
A few thousandths of an inch.
Third class lever.
Same.

19. What is another way to find the mechanical advantage of an inclined plane?
Foot- pounds
Length of ramp/length of height from floor to truck
Simple machine
Opposite.

20. What does a micrometer measure?
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.
Magnify or reduce the force which you apply.
your arm.

21. Gears can do a job for you by changing what three things?
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
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.

22. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The change of the direction of the pull.
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.
Magnify or reduce the force which you apply.

23. What is the jack screw used for?
A screw and a spur gear.
Can change the direction of motion.
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.

24. What is the mechanical advantage for a single fixed block?
Magnify or reduce the force which you apply.
1
The rope that passes through your hands is greater than the distance that the load is raised.
Direction - speed or size of the force applied.

25. What is the third thing a gear can do?
Two surfaces move against one another.
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Positive mechanical advantage.

26. What is the work formula?
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
32/8 = 4
To raise a house or other heavy machinery.

27. 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.
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 modification of an inclined plane.
To speed up the motion of resistence.

28. How do you find the mechanical advantage?
Wheel and axle.
Same.
fulcrum- weight- effort
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. The threads of a screw are cut so?
45
The change of the direction of the pull.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.

30. What is the lever formula?
To magnify the applied force.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time
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.

31. How do you measure power?
In Horsepower.
Third class lever.
Foot- pounds
Increase or decrease the the speed of the applied motion.

32. An egg beater has a mechanical advantage of what?
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.
Less than 1.

33. The worm gear is a combination of what?
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 screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.

34. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time

35. Fractional mechanical advantage
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.

36. What is an example of a third class lever?
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.
In pounds.
your arm.

37. What is the second thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
Door knob.
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.

38. A miter gear connects what?
Positive mechanical advantage.
Wheel and axle.
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.

39. What are first and third class levers used for?
Feet.
Connects shafts having a 90 degree angle.
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.

40. What is the first thing a gear can do?
To speed up the motion of resistence.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
Can change the direction of motion.

41. Work is measured in units also known as?
To raise a house or other heavy machinery.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds

42. What type of lever provides a fractional mechanical advantage?
To raise a house or other heavy machinery.
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.
Third class lever.
Magnify or reduce the force which you apply.

43. What is another example of a 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(pie)/pitch
Wheel and axle.
Door knob.

44. How is distance measured in work?
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
A few thousandths of an inch.

45. What kind of machine is the inclined plane?
The change of the direction of the pull.
Simple machine
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.

46. What direction does the effort and resistance move in first class levers?
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.
Opposite.

47. The bevel gear is used to connect what?
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
Count the number of parts of the rope going to and from the movable block.
Shafts lying at any given angle.

48. How can you decrease friction on flat surfaces?
your arm.
With oil - grease or soap.
In Horsepower.
Same.

49. How can you figure out the mechanical advantage of most block and falls by glance?
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
45

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?
Two surfaces move against one another.
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
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4