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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 direction does the effort and resistance move in third class levers.
Shafts lying at any given angle.
Same.
To raise a house or other heavy machinery.
Wheel and axle.

2. What type of lever provides a fractional mechanical advantage?
Same.
fulcrum- weight- effort
Wheel and axle.
Third class lever.

3. What is one type of second class lever?
Positive mechanical advantage.
2(pie)/pitch
Simple machine
Wheel and axle.

4. How do you find the 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.
Two surfaces move against one another.
In pounds.
your arm.

5. What is the mechanical advantage of a single movable block?
2(pie)/pitch
Simple machine
2. Each half of the rope carries an equal amount of weight.
Less than 1.

6. What direction does the effort and resistance move in first class levers?
Opposite.
A few thousandths of an inch.
In pounds.
Wheel and axle.

7. How do you measure power?
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In Horsepower.

8. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Power=Work/Time

9. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Positive mechanical advantage.

10. What is the power formula?
Power=Work/Time
Shafts lying at any given angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.

11. The worm gear is a combination of what?
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
Third class lever.
Foot- pounds

12. The miter gear faces are beveled at what angle?
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
45
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

13. How is distance measured in work?
Feet.
Two surfaces move against one another.
Third class lever.
The force used to overcome friction is greater than the force used to do useful work.

14. What is another way to find the mechanical advantage of an inclined plane?
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

15. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.

16. What is the formula for the wheel and axle?
A few thousandths of an inch.
Less than 1.
A screw and a spur gear.
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

17. Gears can do a job for you by changing what three things?
your arm.
Door knob.
Direction - speed or size of the force applied.
Work=Force*Distance

18. 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?
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
Foot- pounds
Less than 1.

19. What is another example of a wheel and axle?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.

20. What is the purpose of a third class lever?
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
To speed up the motion of resistence.
Work=Force*Distance

21. What is the second thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
Simple machine
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.

22. What kind of machine is the inclined plane?
Simple machine
Opposite.
Door knob.
Connects shafts having a 90 degree angle.

23. hat is a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
1
A modification of an inclined plane.
Direction - speed or size of the force applied.

24. An egg beater has a mechanical advantage of what?
To raise a house or other heavy machinery.
Less than 1.
Positive mechanical advantage.
The change of the direction of the pull.

25. Work is measured in units also known as?
Foot- pounds
Work=Force*Distance
fulcrum- weight- effort
Third class lever.

26. What is the mechanical advantage for a single fixed block?
The force used to overcome friction is greater than the force used to do useful work.
1
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.

27. Friction is involved when?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Two surfaces move against one another.
To raise a house or other heavy machinery.
Door knob.

28. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
A few thousandths of an inch.
Equals the weight of the object being hoisted.

29. What is the theoretical mechanical advantage of any gear train?
Equals the weight of the object being hoisted.
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The force used to overcome friction is greater than the force used to do useful work.

30. What are the 4 forces?
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil
Wheel and axle.
To raise a house or other heavy machinery.

31. The bevel gear is used to connect what?
Power=Work/Time
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.

32. A miter gear connects what?
Opposite.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
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

33. 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.
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Gravity - Magnetism - Friction - Recoil

34. What does a micrometer measure?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A few thousandths of an inch.
your arm.
Length of ramp/length of height from floor to truck

35. How is work done?
In pounds.
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck

36. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.

37. What is the work formula?
In pounds.
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.

38. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Shafts lying at any given angle.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.

39. What is the first thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
In Horsepower.
Can change the direction of motion.
Two surfaces move against one another.

40. What is the formula for the mechanical advantage of a screw?
A few thousandths of an inch.
fulcrum- weight- effort
Positive mechanical advantage.
2(pie)/pitch

41. What are first and third class levers used for?
Length of ramp/length of height from floor to truck
Work=Force*Distance
To magnify the applied force.
your arm.

42. Class two lever
Foot- pounds
With oil - grease or soap.
fulcrum- weight- effort
Equals the weight of the object being hoisted.

43. What kind of mechanical advantage does the first and second class lever provide?
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

44. How is force measured in work?
In Horsepower.
Foot- pounds
In pounds.
2. Each half of the rope carries an equal amount of weight.

45. What direction does the effort and resistance move in the second class levers?
To raise a house or other heavy machinery.
The change of the direction of the pull.
Same.
Opposite.

46. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

47. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
A modification of an inclined plane.
Feet.
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.

48. What is an example of a third class lever?
your arm.
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Shafts lying at any given angle.

49. What is the third thing a gear can do?
To speed up the motion of resistence.
With oil - grease or soap.
Magnify or reduce the force which you apply.
Feet.

50. What is the lever formula?
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.
Direction - speed or size of the force applied.
Wheel and axle.