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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. How can you figure out the mechanical advantage of most block and falls by glance?
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

2. The miter gear faces are beveled at what angle?
45
To speed up the motion of resistence.
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.

3. What are the 4 forces?
In pounds.
Door knob.
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil

4. What is the formula for the wheel and axle?
Magnify or reduce the force which you apply.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
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

5. What direction does the effort and resistance move in the second class levers?
Increase or decrease the the speed of the applied motion.
Same.
In pounds.
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.

6. The worm gear is a combination of what?
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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 screw and a spur gear.

7. How is force measured in work?
In pounds.
Foot- pounds
Same.
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

8. How is distance measured in work?
Feet.
Equals the weight of the object being hoisted.
A few thousandths of an inch.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

9. What is the mechanical advantage for a single fixed block?
Same.
To speed up the motion of resistence.
1
Foot- pounds

10. What direction does the effort and resistance move in first class levers?
To speed up the motion of resistence.
Less than 1.
Power=Work/Time
Opposite.

11. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time

12. What is the first thing a gear can do?
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.
Same.
Same.

13. Friction is involved when?
Power=Work/Time
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

14. What is an example of a third class lever?
Length of ramp/length of height from floor to truck
your arm.
Less than 1.
Count the number of parts of the rope going to and from the movable block.

15. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.

16. What is another way to find the mechanical advantage of an inclined plane?
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.
Equals the weight of the object being hoisted.
Length of ramp/length of height from floor to truck

17. A miter gear connects what?
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2(pie)/pitch
Connects shafts having a 90 degree angle.

18. What are first and third class levers used for?
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
To magnify the applied force.
Two surfaces move against one another.

19. What type of lever provides a fractional mechanical advantage?
To magnify the applied force.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.

20. What is one type of second class lever?
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
Wheel and axle.
Door knob.

21. Fractional mechanical advantage
Simple machine
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
A screw and a spur gear.

22. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
45
2(pie)/pitch
Equals the weight of the object being hoisted.

23. Work is measured in units also known as?
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.
Foot- pounds

24. What is the theoretical mechanical advantage of any gear train?
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds

25. How is work done?
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
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.

26. How can you decrease friction on flat surfaces?
Equals the weight of the object being hoisted.
1
A screw and a spur gear.
With oil - grease or soap.

27. What kind of machine is the inclined plane?
Shafts lying at any given angle.
1
Simple machine
A few thousandths of an inch.

28. What is the purpose of a third class lever?
To speed up the motion of resistence.
With oil - grease or soap.
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
Two surfaces move against one another.

29. Class two lever
A screw and a spur gear.
2(pie)/pitch
fulcrum- weight- effort
Wheel and axle.

30. The bevel gear is used to connect what?
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
Power=Work/Time

31. How do you measure power?
To magnify the applied force.
In Horsepower.
Can change the direction of motion.
Simple machine

32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
With oil - grease or soap.

33. Formula for fractional mechanical disadvantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
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.

34. What does a micrometer measure?
To raise a house or other heavy machinery.
Less than 1.
With oil - grease or soap.
A few thousandths of an inch.

35. hat is a screw?
Less than 1.
Positive mechanical advantage.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

36. What is the jack screw used for?
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.
To speed up the motion of resistence.
Feet.

37. How do you find the mechanical advantage?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven 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.
Less than 1.
1

38. What is the second thing a gear can do?
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
your arm.
To raise a house or other heavy machinery.

39. What is the work formula?
fulcrum- weight- effort
To speed up the motion of resistence.
Work=Force*Distance
With oil - grease or soap.

40. What is the lever formula?
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.

41. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Same.
Can change the direction of motion.
When a resistance is overcome by a force acting through a measurable distance.

42. An egg beater has a mechanical advantage of what?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.
Less than 1.

43. 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?
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
1
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

44. What direction does the effort and resistance move in third class levers.
Power=Work/Time
Positive mechanical advantage.
Same.
A few thousandths of an inch.

45. What is the power formula?
Same.
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.
32/8 = 4
Power=Work/Time

46. With a single fixed sheave what is the only mechanical advantage?
Magnify or reduce the force which you apply.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

47. What kind of mechanical advantage does the first and second class lever provide?
To raise a house or other heavy machinery.
Positive mechanical advantage.
Magnify or reduce the force which you apply.
Foot- pounds

48. What is the mechanical advantage of a single movable block?
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
Feet.
2. Each half of the rope carries an equal amount of weight.
your arm.

49. What is another example of a wheel and axle?
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Door knob.
Positive mechanical advantage.

50. What is the ratio of any gear train?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.