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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.
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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 another example of a wheel and axle?
2(pie)/pitch
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
Door knob.

2. What is the lever formula?
Increase or decrease the the speed of the applied motion.
The force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

3. A miter gear connects what?
Connects shafts having a 90 degree angle.
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
fulcrum- weight- effort
Can change the direction of motion.

4. What does a micrometer measure?
Direction - speed or size of the force applied.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.

5. Gears can do a job for you by changing what three things?
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Third class lever.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

6. How do you find the mechanical advantage?
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.
Door knob.
To magnify the applied force.
To speed up the motion of resistence.

7. What kind of machine is the inclined plane?
Door knob.
Length of ramp/length of height from floor to truck
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Simple machine

8. What is the purpose of a third class lever?
To raise a house or other heavy machinery.
To speed up the motion of resistence.
Power=Work/Time
Same.

9. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Equals the weight of the object being hoisted.
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
The rope that passes through your hands is greater than the distance that the load is raised.

10. The bevel gear is used to connect what?
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.

11. What direction does the effort and resistance move in first class levers?
Opposite.
Less than 1.
A few thousandths of an inch.
1

12. What is the mechanical advantage of a single movable block?
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance

13. The threads of a screw are cut so?
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.

14. What is the power formula?
A modification of an inclined plane.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.
Power=Work/Time

15. 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
Door knob.
Can change the direction of motion.
A screw and a spur gear.

16. What is the ratio of any gear train?
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

17. What is the formula for the mechanical advantage of a screw?
Less than 1.
2(pie)/pitch
1
A screw and a spur gear.

18. What direction does the effort and resistance move in third class levers.
45
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.
Feet.
Same.

19. What type of lever provides a fractional mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.
2(pie)/pitch
A few thousandths of an inch.

20. How can you decrease friction on flat surfaces?
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
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

21. What direction does the effort and resistance move in the second class levers?
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
To raise a house or other heavy machinery.
Same.

22. What is the work formula?
Same.
A screw and a spur gear.
Work=Force*Distance
To raise a house or other heavy machinery.

23. 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.
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.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.

24. How is force measured in work?
In pounds.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.

25. How do you measure power?
Direction - speed or size of the force applied.
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
In Horsepower.

26. What is the theoretical mechanical advantage of any gear train?
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

27. What is an example of a third class lever?
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.

28. What are the 4 forces?
Same.
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.

29. What is one type of second class lever?
Third class lever.
Shafts lying at any given angle.
Same.
Wheel and axle.

30. 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?
A modification of an inclined plane.
Can change the direction of motion.
32/8 = 4
Power=Work/Time

31. What is the first thing a gear can do?
Connects shafts having a 90 degree angle.
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.

32. How is work done?
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
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.

33. What is another way to find the mechanical advantage of an inclined plane?
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Length of ramp/length of height from floor to truck
In Horsepower.

34. hat is a screw?
32/8 = 4
Two surfaces move against one another.
Same.
A modification of an inclined plane.

35. The miter gear faces are beveled at what angle?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
45
Connects shafts having a 90 degree angle.

36. What is the third thing a gear can do?
fulcrum- weight- effort
Magnify or reduce the force which you apply.
In Horsepower.
45

37. How is distance measured in work?
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.
Simple machine
Feet.
Foot- pounds

38. What kind of mechanical advantage does the first and second class lever provide?
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
Power=Work/Time
Can change the direction of motion.

39. Fractional mechanical advantage
The change of the direction of the pull.
A few thousandths of an inch.
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.

40. Friction is involved when?
Two surfaces move against one another.
45
Wheel and axle.
1

41. What are first and third class levers used for?
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
Connects shafts having a 90 degree angle.

42. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Can change the direction of motion.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

43. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.

44. What is the mechanical advantage for a single fixed block?
Two surfaces move against one another.
1
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.

45. What is the jack screw used for?
To raise a house or other heavy machinery.
Door knob.
Power=Work/Time
The change of the direction of the pull.

46. Class two lever
Increase or decrease the the speed of the applied motion.
Power=Work/Time
fulcrum- weight- effort
Direction - speed or size of the force applied.

47. What is the second thing a gear can do?
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.

48. Work is measured in units also known as?
Foot- pounds
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.
1

49. Formula for fractional mechanical disadvantage.
32/8 = 4
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.

50. The worm gear is a combination of what?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
Less than 1.
A screw and a spur gear.