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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. A miter gear connects what?
Work=Force*Distance
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.

2. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
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.
Less than 1.

3. The threads of a screw are cut so?
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

4. With a single fixed sheave what is the only mechanical advantage?
Same.
A few thousandths of an inch.
The change of the direction of the pull.
In pounds.

5. What is the work formula?
Can change the direction of motion.
Work=Force*Distance
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

6. What is the formula for the wheel and axle?
Foot- pounds
In pounds.
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

7. What are first and third class levers used for?
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Wheel and axle.
To magnify the applied force.

8. How do you find the mechanical advantage?
To magnify the applied force.
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.
Same.

9. Gears can do a job for you by changing what three things?
Simple machine
Work=Force*Distance
A modification of an inclined plane.
Direction - speed or size of the force applied.

10. Class two lever
Third class lever.
fulcrum- weight- effort
Can change the direction of motion.
Equals the weight of the object being hoisted.

11. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.

12. Formula for fractional mechanical disadvantage.
To magnify the applied force.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds

13. What direction does the effort and resistance move in third class levers.
2(pie)/pitch
Opposite.
2. Each half of the rope carries an equal amount of weight.
Same.

14. What is the ratio of any gear train?
With oil - grease or soap.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time

15. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
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.

16. What is another example of a wheel and axle?
Magnify or reduce the force which you apply.
Door knob.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.

17. What kind of mechanical advantage does the first and second class lever provide?
In pounds.
Positive mechanical advantage.
your arm.
Count the number of parts of the rope going to and from the movable block.

18. The miter gear faces are beveled at what angle?
To raise a house or other heavy machinery.
Shafts lying at any given angle.
Feet.
45

19. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.
To speed up the motion of resistence.
Gravity - Magnetism - Friction - Recoil

20. 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.
Two surfaces move against one another.
A screw and a spur gear.
32/8 = 4

21. What is the third thing a gear can do?
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.
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.

22. How can you figure out the mechanical advantage of most block and falls by glance?
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
Less than 1.
Count the number of parts of the rope going to and from the movable block.

23. What is the jack screw used for?
Gravity - Magnetism - Friction - Recoil
Door knob.
A screw and a spur gear.
To raise a house or other heavy machinery.

24. What is the mechanical advantage for a single fixed block?
A modification of an inclined plane.
1
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

25. What kind of machine is the inclined plane?
With oil - grease or soap.
Simple machine
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The rope that passes through your hands is greater than the distance that the load is raised.

26. What is an example of a third class lever?
Magnify or reduce the force which you apply.
your arm.
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.

27. What is one type of second class lever?
A screw and a spur gear.
Feet.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.

28. What is another way to find the mechanical advantage of an inclined plane?
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance
Power=Work/Time
Length of ramp/length of height from floor to truck

29. What is the first thing a gear can do?
Foot- pounds
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.

30. What direction does the effort and resistance move in first class levers?
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
In Horsepower.

31. What is the power formula?
Direction - speed or size of the force applied.
45
Third class lever.
Power=Work/Time

32. How do you measure power?
In Horsepower.
Shafts lying at any given angle.
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.

33. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
Two surfaces move against one another.
fulcrum- weight- effort

34. How is force measured in work?
In pounds.
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
Equals the weight of the object being hoisted.

35. What is the lever formula?
Two surfaces move against one another.
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.
To raise a house or other heavy machinery.

36. What does a micrometer measure?
Third class lever.
Simple machine
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.

37. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.
To magnify the applied force.

38. How is distance measured in work?
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
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

39. hat is a screw?
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
To speed up the motion of resistence.

40. Friction is involved when?
A screw and a spur gear.
Two surfaces move against one another.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.

41. How can you decrease friction on flat surfaces?
Power=Work/Time
Same.
Door knob.
With oil - grease or soap.

42. An egg beater has a mechanical advantage of what?
Less than 1.
1
Shafts lying at any given angle.
your arm.

43. What is the purpose of a third class lever?
To speed up the motion of resistence.
Same.
Wheel and axle.
Third class lever.

44. The worm gear is a combination of what?
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
A screw and a spur gear.

45. Work is measured in units also known as?
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.
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.
Foot- pounds

46. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
In Horsepower.
Length of ramp/length of height from floor to truck

47. The bevel gear is used to connect what?
In pounds.
Simple machine
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.

48. What is the mechanical advantage of a single movable block?
2(pie)/pitch
Opposite.
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.

49. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.
Feet.

50. What is the theoretical mechanical advantage of any gear train?
Simple machine
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.