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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?
Feet.
Two surfaces move against one another.
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.

2. What type of lever provides a fractional mechanical advantage?
With oil - grease or soap.
Less than 1.
Third class lever.
fulcrum- weight- effort

3. What is the formula for the mechanical advantage of a screw?
Foot- pounds
Power=Work/Time
fulcrum- weight- effort
2(pie)/pitch

4. What are the 4 forces?
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.

5. What is the jack screw used for?
Direction - speed or size of the force applied.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

6. A miter gear connects what?
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
In pounds.
Connects shafts having a 90 degree angle.

7. Formula for fractional mechanical disadvantage.
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.
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.

8. 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?
Same.
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.

9. What direction does the effort and resistance move in the second class levers?
Feet.
A few thousandths of an inch.
Same.
Door knob.

10. How is distance measured in work?
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
Feet.
Direction - speed or size of the force applied.

11. What is one type of second class lever?
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
In Horsepower.
Count the number of parts of the rope going to and from the movable block.

12. What is the first thing a gear can do?
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.
2. Each half of the rope carries an equal amount of weight.
Can change the direction of motion.

13. What kind of mechanical advantage does the first and second class lever provide?
1
In Horsepower.
Positive mechanical advantage.
Can change the direction of motion.

14. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
32/8 = 4
2(pie)/pitch
Magnify or reduce the force which you apply.

15. Work is measured in units also known as?
Feet.
Foot- pounds
Third class lever.
To magnify the applied force.

16. The threads of a screw are cut so?
Less than 1.
Direction - speed or size of the force applied.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.

17. 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.
To magnify the applied force.
1
Magnify or reduce the force which you apply.

18. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Positive mechanical advantage.
To raise a house or other heavy machinery.
Third class lever.

19. What is the ratio of any gear train?
When a resistance is overcome by a force acting through a measurable 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.
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.

20. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.

21. How can you figure out the mechanical advantage of most block and falls by glance?
Less than 1.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

22. How is work done?
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.
1
To magnify the applied force.

23. Fractional mechanical advantage
To speed up the motion of resistence.
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.
32/8 = 4

24. Gears can do a job for you by changing what three things?
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
Foot- pounds
Direction - speed or size of the force applied.

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

26. hat is a screw?
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
With oil - grease or soap.
45

27. What is the power formula?
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
Count the number of parts of the rope going to and from the movable block.
Third class lever.

28. Class two lever
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
fulcrum- weight- effort

29. 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.
Foot- pounds
Third class lever.
Work=Force*Distance

30. What is the second thing a gear can do?
Third class lever.
To raise a house or other heavy machinery.
Door knob.
Increase or decrease the the speed of the applied motion.

31. What is the work formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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
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. The worm gear is a combination of what?
Shafts lying at any given angle.
1
A screw and a spur gear.
Work=Force*Distance

33. What are first and third class levers used for?
Magnify or reduce the force which you apply.
Less than 1.
Positive mechanical advantage.
To magnify the applied force.

34. What is the formula for the wheel and axle?
Door knob.
Third class lever.
Increase or decrease the the speed of the applied 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

35. What is the mechanical advantage for a single fixed block?
1
32/8 = 4
Power=Work/Time
Feet.

36. What is the purpose of a third class lever?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To speed up the motion of resistence.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck

37. What kind of machine is the inclined plane?
Simple machine
With oil - grease or soap.
Less than 1.
In Horsepower.

38. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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.
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.

39. The bevel gear is used to connect what?
Gravity - Magnetism - Friction - Recoil
Less than 1.
Shafts lying at any given angle.
To speed up the motion of resistence.

40. What does a micrometer measure?
Two surfaces move against one another.
Door knob.
A few thousandths of an inch.
Opposite.

41. What is another example of a wheel and axle?
Can change the direction of motion.
Door knob.
In Horsepower.
Direction - speed or size of the force applied.

42. How is force measured in work?
Door knob.
In pounds.
Same.
Equals the weight of the object being hoisted.

43. An egg beater has a mechanical advantage of what?
Direction - speed or size of the force applied.
Power=Work/Time
Opposite.
Less than 1.

44. What is an example of a third class lever?
Two surfaces move against one another.
your arm.
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.

45. How do you find the mechanical advantage?
Can change the direction of motion.
Shafts lying at any given angle.
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.

46. What direction does the effort and resistance move in third class levers.
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
Direction - speed or size of the force applied.
Same.

47. What direction does the effort and resistance move in first class levers?
Magnify or reduce the force which you apply.
Third class lever.
Opposite.
Same.

48. How can you decrease friction on flat surfaces?
In Horsepower.
32/8 = 4
With oil - grease or soap.
Opposite.

49. What is the third thing a gear can do?
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.
With oil - grease or soap.
Magnify or reduce the force which you apply.

50. How do you measure power?
Feet.
1
In pounds.
In Horsepower.