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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 ratio of any gear train?
2(pie)/pitch
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 speed up the motion of resistence.
Same.

2. The threads of a screw are cut so?
Can change the direction of motion.
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.

3. What does a micrometer measure?
fulcrum- weight- effort
A few thousandths of an inch.
Shafts lying at any given angle.
2(pie)/pitch

4. What are first and third class levers used for?
To raise a house or other heavy machinery.
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

5. What is one type of second class lever?
In Horsepower.
Wheel and axle.
Length of ramp/length of height from floor to truck
The change of the direction of the pull.

6. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Door knob.
The force used to overcome friction is greater than the force used to do useful work.
In pounds.

7. What direction does the effort and resistance move in third class levers.
Work=Force*Distance
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
Same.

8. What are the 4 forces?
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
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

9. What direction does the effort and resistance move in the second class levers?
Same.
Can change the direction of motion.
Two surfaces move against one another.
Power=Work/Time

10. How do you find the mechanical advantage?
Length of ramp/length of height from floor to truck
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.
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.

11. With a single fixed sheave what is the only mechanical advantage?
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.

12. The miter gear faces are beveled at what angle?
Same.
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
45

13. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.
A few thousandths of an inch.

14. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Two surfaces move against one another.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

15. How can you decrease friction on flat surfaces?
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
With oil - grease or soap.
Direction - speed or size of the force applied.

16. Friction is involved when?
Power=Work/Time
Magnify or reduce the force which you apply.
Wheel and axle.
Two surfaces move against one another.

17. The bevel gear is used to connect what?
Shafts lying at any given angle.
fulcrum- weight- effort
Power=Work/Time
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

18. An egg beater has a mechanical advantage of what?
Less than 1.
To magnify the applied force.
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 change of the direction of the pull.

19. What direction does the effort and resistance move in first class levers?
Opposite.
Foot- pounds
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.

20. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Door knob.
Direction - speed or size of the force applied.

21. Fractional mechanical advantage
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.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

22. What kind of mechanical advantage does the first and second class lever provide?
Can change the direction of motion.
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.

23. What kind of machine is the inclined plane?
To raise a house or other heavy machinery.
A few thousandths of an inch.
Simple machine
Count the number of parts of the rope going to and from the movable block.

24. 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?
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
32/8 = 4
fulcrum- weight- effort

25. Work is measured in units also known as?
A screw and a spur gear.
In pounds.
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
Foot- pounds

26. The worm gear is a combination of what?
Same.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
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.

27. Class two lever
Two surfaces move against one another.
45
Door knob.
fulcrum- weight- effort

28. Gears can do a job for you by changing what three things?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Can change the direction of motion.
32/8 = 4
Direction - speed or size of the force applied.

29. How is distance measured in work?
The force used to overcome friction is greater than the force used to do useful work.
Feet.
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.

30. What is the lever formula?
The rope that passes through your hands is greater than the distance that the load is raised.
1
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

31. 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
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.
Two surfaces move against one another.

32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
Same.

33. hat is a screw?
Door knob.
A modification of an inclined plane.
Work=Force*Distance
Power=Work/Time

34. How do you measure power?
Work=Force*Distance
In Horsepower.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

35. A miter gear connects what?
your arm.
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

36. What is the first thing a gear can do?
To speed up the motion of resistence.
Foot- pounds
Can change the direction of motion.
Simple machine

37. What is the mechanical advantage for a single fixed block?
Wheel and axle.
In Horsepower.
1
Direction - speed or size of the force applied.

38. What is the theoretical mechanical advantage of any gear train?
Less than 1.
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.

39. What is another example of a wheel and axle?
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
Door knob.
With oil - grease or soap.

40. How is force measured in work?
In pounds.
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.
Work=Force*Distance

41. How can you figure out the mechanical advantage of most block and falls by glance?
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.
Count the number of parts of the rope going to and from the movable block.
Same.

42. What type of lever provides a fractional mechanical advantage?
Wheel and axle.
Third class lever.
To speed up the motion of resistence.
your arm.

43. What is the power formula?
A few thousandths of an inch.
Less than 1.
Positive mechanical advantage.
Power=Work/Time

44. What is the work formula?
Work=Force*Distance
To speed up the motion of resistence.
Same.
Direction - speed or size of the force applied.

45. What is the jack screw used for?
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
45
With oil - grease or soap.

46. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.

47. Formula for fractional mechanical disadvantage.
45
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil

48. What is another way to find the mechanical advantage of an inclined plane?
Can change the direction of motion.
Same.
Length of ramp/length of height from floor to truck
A screw and a spur gear.

49. What is the purpose of a third class lever?
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

50. What is an example of a third class lever?
Simple machine
A modification of an inclined plane.
your arm.
1