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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 are first and third class levers used for?
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.
To magnify the applied force.
Same.

2. What is the mechanical advantage of a single movable block?
A screw and a spur gear.
Can change the direction of motion.
Feet.
2. Each half of the rope carries an equal amount of weight.

3. What are the 4 forces?
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.
2(pie)/pitch

4. What kind of machine is the inclined plane?
Simple machine
Opposite.
1
Gravity - Magnetism - Friction - Recoil

5. How can you decrease friction on flat surfaces?
fulcrum- weight- effort
A screw and a spur gear.
With oil - grease or soap.
Door knob.

6. What does a micrometer measure?
The change of the direction of the pull.
A few thousandths of an inch.
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.

7. What direction does the effort and resistance move in first class levers?
Magnify or reduce the force which you apply.
Power=Work/Time
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.

8. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
A screw and a spur gear.
45
The force used to overcome friction is greater than the force used to do useful work.

9. Work is measured in units also known as?
Opposite.
2(pie)/pitch
Foot- pounds
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

10. Friction is involved when?
Shafts lying at any given angle.
Foot- pounds
Same.
Two surfaces move against one another.

11. What is the third thing a gear can do?
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.
32/8 = 4

12. How do you measure power?
In Horsepower.
A modification of an inclined plane.
1
Count the number of parts of the rope going to and from the movable block.

13. What direction does the effort and resistance move in third class levers.
Two surfaces move against one another.
A few thousandths of an inch.
Same.
A screw and a spur gear.

14. A miter gear connects what?
1
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.

15. The miter gear faces are beveled at what angle?
2. Each half of the rope carries an equal amount of weight.
45
Door knob.
Power=Work/Time

16. With a single fixed sheave what is the only mechanical advantage?
Length of ramp/length of height from floor to truck
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.

17. The bevel gear is used to connect what?
A screw and a spur gear.
Shafts lying at any given angle.
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

18. What is another way to find the mechanical advantage of an inclined plane?
Wheel and axle.
Length of ramp/length of height from floor to truck
Positive mechanical advantage.
Work=Force*Distance

19. What is the jack screw used for?
To raise a house or other heavy machinery.
Same.
Simple machine
Two surfaces move against one another.

20. How can you figure out the mechanical advantage of most block and falls by glance?
32/8 = 4
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.

21. What direction does the effort and resistance move in the second class levers?
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
A few thousandths of an inch.

22. Gears can do a job for you by changing what three things?
Same.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.

23. What is the purpose of a third class lever?
Feet.
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. The threads of a screw are cut so?
The change of the direction of the pull.
Equals the weight of the object being hoisted.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.

25. What is the lever formula?
Two surfaces move against one another.
45
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.

26. What is the mechanical advantage for a single fixed block?
Same.
Equals the weight of the object being hoisted.
1
Positive mechanical advantage.

27. Fractional mechanical advantage
The rope that passes through your hands is greater than the distance that the load is raised.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.

28. How is distance measured in work?
Feet.
Shafts lying at any given angle.
your arm.
Simple machine

29. What is the first thing a gear can do?
To magnify the applied force.
Can change the direction of motion.
Opposite.
In Horsepower.

30. What is the work formula?
A screw and a spur gear.
In pounds.
Work=Force*Distance
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

31. What is the power formula?
Length of ramp/length of height from floor to truck
Foot- pounds
Power=Work/Time
Third class lever.

32. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
32/8 = 4
your arm.
In Horsepower.

33. What is another example of a wheel and axle?
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil
Door knob.

34. The worm gear is a combination of what?
A screw and a spur gear.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck

35. Class two lever
32/8 = 4
Third class lever.
fulcrum- weight- effort
Same.

36. What is the theoretical mechanical advantage of any gear train?
45
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Count the number of parts of the rope going to and from the movable block.

37. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
Length of ramp/length of height from floor to truck

38. hat is a screw?
With oil - grease or soap.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

39. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

40. How do you find the mechanical advantage?
Two surfaces move against one another.
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
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.

41. How is force measured in work?
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds
With oil - grease or soap.

42. How is work done?
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.
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

43. An egg beater has a mechanical advantage of what?
Simple machine
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Less than 1.

44. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Can change the direction of motion.
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

45. What type of lever provides a fractional mechanical advantage?
Simple machine
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2. Each half of the rope carries an equal amount of weight.

46. What is the formula for the wheel and axle?
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
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
Can change the direction of motion.

47. What is an example of a third class lever?
your arm.
Power=Work/Time
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.
Count the number of parts of the rope going to and from the movable block.

48. What is one type of second class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

49. 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?
Same.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
32/8 = 4

50. Formula for fractional mechanical disadvantage.
The force used to overcome friction is greater than the force used to do useful work.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.