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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 the jack screw used for?
Same.
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.
Simple machine

2. What is one type of second class lever?
Wheel and axle.
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance

3. What is an example of a third class lever?
your arm.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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

4. How is distance measured in work?
Increase or decrease the the speed of the applied motion.
Feet.
Power=Work/Time
Work=Force*Distance

5. What is another way to find the mechanical advantage of an inclined plane?
To raise a house or other heavy machinery.
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
In pounds.

6. hat is a screw?
A modification of an inclined plane.
fulcrum- weight- effort
To speed up the motion of resistence.
Third class lever.

7. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.
When a resistance is overcome by a force acting through a measurable distance.
your arm.

8. What does a micrometer measure?
Third class lever.
In Horsepower.
Can change the direction of motion.
A few thousandths of an inch.

9. Formula for fractional mechanical disadvantage.
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
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.
The force used to overcome friction is greater than the force used to do useful work.

10. What direction does the effort and resistance move in third class levers.
Direction - speed or size of the force applied.
Same.
When a resistance is overcome by a force acting through a measurable distance.
1

11. How is work done?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

12. What is the lever formula?
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time

13. Work is measured in units also known as?
32/8 = 4
Simple machine
Two surfaces move against one another.
Foot- pounds

14. What is the formula for the wheel and axle?
Increase or decrease the the speed of the applied motion.
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
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

15. How can you decrease friction on flat surfaces?
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
To raise a house or other heavy machinery.
Third class lever.
With oil - grease or soap.

16. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Count the number of parts of the rope going to and from the movable block.
45
Magnify or reduce the force which you apply.

17. Class two lever
Two surfaces move against one another.
fulcrum- weight- effort
In pounds.
Power=Work/Time

18. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
A screw and a spur gear.
Equals the weight of the object being hoisted.
2(pie)/pitch

19. What are the 4 forces?
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck

20. What kind of mechanical advantage does the first and second class lever provide?
Shafts lying at any given angle.
Positive mechanical advantage.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

21. How do you find the mechanical advantage?
32/8 = 4
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.
A screw and a spur gear.
To magnify the applied force.

22. What is the power formula?
Feet.
Power=Work/Time
Door knob.
Direction - speed or size of the force applied.

23. What is the second thing a gear can do?
Door knob.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
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

24. 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.
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.

25. What direction does the effort and resistance move in first class levers?
Opposite.
Less than 1.
To magnify the applied force.
Same.

26. The bevel gear is used to connect what?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
Shafts lying at any given angle.

27. What is the mechanical advantage of a single 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.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
Magnify or reduce the force which you apply.

28. An egg beater has a mechanical advantage of what?
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.
Two surfaces move against one another.
Less than 1.
Feet.

29. The threads of a screw are cut so?
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.
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.

30. How can you figure out the mechanical advantage of most block and falls by glance?
Direction - speed or size of the force applied.
Door knob.
2. Each half of the rope carries an equal amount of weight.
Count the number of parts of the rope going to and from the movable block.

31. What is the mechanical advantage for a single fixed block?
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.
1

32. What is the purpose of a third class lever?
To speed up the motion of resistence.
Work=Force*Distance
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Equals the weight of the object being hoisted.

33. What is the theoretical mechanical advantage of any gear train?
Third class lever.
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

34. How do you measure power?
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
Same.
In Horsepower.

35. The miter gear faces are beveled at what angle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
With oil - grease or soap.
Magnify or reduce the force which you apply.
45

36. How is force measured in work?
Length of ramp/length of height from floor to truck
In pounds.
Door knob.
To speed up the motion of resistence.

37. What type of lever provides a fractional mechanical advantage?
Simple machine
2(pie)/pitch
Third class lever.
In Horsepower.

38. Gears can do a job for you by changing what three things?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.
Simple machine
Increase or decrease the the speed of the applied motion.

39. What is the work formula?
Work=Force*Distance
Third class lever.
Simple machine
Can change the direction of motion.

40. Fractional mechanical advantage
Same.
Same.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.

41. What is the ratio of any gear train?
Wheel and axle.
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.
To magnify the applied force.

42. What is the first thing a gear can do?
Can change the direction of motion.
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.

43. Friction is involved when?
With oil - grease or soap.
Two surfaces move against one another.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.

44. 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?
32/8 = 4
In Horsepower.
The change of the direction of the pull.
Equals the weight of the object being hoisted.

45. What is the third thing a gear can do?
With oil - grease or soap.
In Horsepower.
Magnify or reduce the force which you apply.
Simple machine

46. What is the formula for the mechanical advantage of a screw?
Work=Force*Distance
Third class lever.
2(pie)/pitch
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

47. A miter gear connects what?
In Horsepower.
Same.
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.

48. What kind of machine is the inclined plane?
Opposite.
Simple machine
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

49. What are first and third class levers used for?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.

50. The worm gear is a combination of what?
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
To raise a house or other heavy machinery.
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.