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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 formula for the wheel and axle?
Less than 1.
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
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.

2. How is work done?
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.

3. How is distance measured in work?
Feet.
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1

4. What are first and third class levers used for?
To magnify the applied force.
Less than 1.
your arm.
1

5. Class two lever
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.

6. The bevel gear is used to connect what?
Work=Force*Distance
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
Two surfaces move against one another.

7. How can you decrease friction on flat surfaces?
With oil - grease or soap.
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.

8. What is the power formula?
Wheel and axle.
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.

9. What is one type of second class lever?
Power=Work/Time
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
Positive mechanical advantage.

10. What is the ratio of any gear train?
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Opposite.
Direction - speed or size of the force applied.

11. What direction does the effort and resistance move in the second class levers?
Power=Work/Time
Third class lever.
Same.
45

12. What direction does the effort and resistance move in third class levers.
Same.
Door knob.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck

13. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.

14. How is force measured in work?
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
A screw and a spur gear.

15. What does a micrometer measure?
The change of the direction of the pull.
In pounds.
Positive mechanical advantage.
A few thousandths of an inch.

16. What is the third thing a gear can do?
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.
Magnify or reduce the force which you apply.
Can change the direction of motion.

17. What is the purpose of a third class lever?
To speed up the motion of resistence.
The change of the direction of the pull.
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil

18. What is the first thing a gear can do?
Can change the direction of motion.
Positive mechanical advantage.
The change of the direction of the pull.
2(pie)/pitch

19. What is another way to find the mechanical advantage of an inclined plane?
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
Length of ramp/length of height from floor to truck
A few thousandths of an inch.

20. What is the theoretical mechanical advantage of any gear train?
A few thousandths of an inch.
To magnify the applied force.
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.

21. Friction is involved when?
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
Simple machine
To magnify the applied force.

22. An egg beater has a mechanical advantage of what?
Less than 1.
Connects shafts having a 90 degree angle.
In pounds.
Can change the direction of motion.

23. The worm gear is a combination of what?
Magnify or reduce the force which you apply.
Two surfaces move against one another.
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. The threads of a screw are cut so?
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time

25. hat is a screw?
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
Power=Work/Time

26. What is the lever formula?
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Two surfaces move against one another.

27. What is the mechanical advantage for a single fixed block?
Count the number of parts of the rope going to and from the movable block.
1
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.

28. With a single fixed sheave what is the only mechanical advantage?
Length of ramp/length of height from floor to truck
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.
In Horsepower.

29. What kind of machine is the inclined plane?
Connects shafts having a 90 degree angle.
In pounds.
Simple machine
To magnify the applied force.

30. What are the 4 forces?
With oil - grease or soap.
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.
Gravity - Magnetism - Friction - Recoil

31. What is the jack screw used for?
To magnify the applied force.
To raise a house or other heavy machinery.
Positive mechanical advantage.
Connects shafts having a 90 degree angle.

32. Fractional mechanical advantage
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
your arm.

33. What direction does the effort and resistance move in first class levers?
Opposite.
Count the number of parts of the rope going to and from the movable block.
your arm.
In pounds.

34. A miter gear connects what?
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
Connects shafts having a 90 degree angle.

35. Work is measured in units also known as?
Foot- pounds
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance
your arm.

36. What is another example of a wheel and axle?
Door knob.
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
Shafts lying at any given angle.
2(pie)/pitch

37. What kind of mechanical advantage does the first and second class lever provide?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
Positive mechanical advantage.

38. The miter gear faces are beveled at what angle?
Direction - speed or size of the force applied.
45
Gravity - Magnetism - Friction - Recoil
In Horsepower.

39. How do you find the mechanical advantage?
To speed up the motion of resistence.
Opposite.
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.
your arm.

40. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Two surfaces move against one another.
45
Equals the weight of the object being hoisted.
To magnify the applied force.

41. What is the work formula?
Direction - speed or size of the force applied.
Work=Force*Distance
Wheel and axle.
Power=Work/Time

42. 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?
Magnify or reduce the force which you apply.
32/8 = 4
Door knob.
Can change the direction of motion.

43. What is the second thing a gear can do?
The change of the direction of the pull.
Wheel and axle.
Simple machine
Increase or decrease the the speed of the applied motion.

44. How do you measure power?
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.
A screw and a spur gear.
In Horsepower.

45. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
Magnify or reduce the force which you apply.

46. 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.
your arm.
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.

47. Formula for fractional mechanical disadvantage.
A screw and a spur gear.
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.
A modification of an inclined plane.

48. What type of lever provides a fractional mechanical advantage?
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
In Horsepower.
Third class lever.

49. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
To raise a house or other heavy machinery.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

50. What is the mechanical advantage of a single movable block?
Shafts lying at any given angle.
your arm.
In pounds.
2. Each half of the rope carries an equal amount of weight.