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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 direction does the effort and resistance move in the second class levers?
A few thousandths of an inch.
Same.
Simple machine
In pounds.

2. What is an example of a third class lever?
Equals the weight of the object being hoisted.
Feet.
With oil - grease or soap.
your arm.

3. What does a micrometer measure?
45
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.

4. What kind of machine is the inclined plane?
Less than 1.
Power=Work/Time
Simple machine
2(pie)/pitch

5. How is work done?
Magnify or reduce the force which you apply.
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.

6. What is another example of a wheel and axle?
To speed up the motion of resistence.
Shafts lying at any given angle.
Door knob.
Power=Work/Time

7. What are first and third class levers used for?
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
Opposite.

8. What is the third thing a gear can do?
Can change the direction of 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.
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.

9. 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.
Can change the direction of motion.
Direction - speed or size of the force applied.
In Horsepower.

10. What is the mechanical advantage of a single movable block?
Same.
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

11. Friction is involved when?
Same.
Equals the weight of the object being hoisted.
Wheel and axle.
Two surfaces move against one another.

12. What is the mechanical advantage for a single fixed block?
your arm.
1
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. A miter gear connects what?
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.

14. What is the power formula?
To speed up the motion of resistence.
1
Power=Work/Time
With oil - grease or soap.

15. How can you decrease friction on flat surfaces?
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.
45

16. What is the theoretical mechanical advantage of any gear train?
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 the driven gears/ divided by the product of the number of teeth on the driver gears.
With oil - grease or soap.
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.

17. Gears can do a job for you by changing what three things?
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.

18. What is the purpose of a third class lever?
45
Foot- pounds
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

19. The worm gear is a combination of what?
Third class lever.
Magnify or reduce the force which you apply.
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil

20. What is the work formula?
45
fulcrum- weight- effort
Work=Force*Distance
1

21. How is force measured in work?
In pounds.
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.
fulcrum- weight- effort

22. 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 screw and a spur gear.
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
Work=Force*Distance

23. What are the 4 forces?
Connects shafts having a 90 degree angle.
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.

24. What is the ratio of any gear train?
Less than 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.
Foot- pounds
To raise a house or other heavy machinery.

25. What is another way to find the mechanical advantage of an inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Count the number of parts of the rope going to and from the movable block.
Simple machine

26. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.
Shafts lying at any given angle.
Foot- pounds

27. What kind of mechanical advantage does the first and second class lever provide?
Wheel and axle.
fulcrum- weight- effort
Positive mechanical advantage.
The change of the direction of the pull.

28. What is one type of second class lever?
Can change the direction of motion.
Wheel and axle.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.

29. How do you measure power?
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.
Two surfaces move against one another.
A modification of an inclined plane.

30. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.

31. Formula for fractional mechanical disadvantage.
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

32. 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.
In Horsepower.
The change of the direction of the pull.
Direction - speed or size of the force applied.

33. What direction does the effort and resistance move in third class levers.
Same.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
Feet.

34. How is distance measured in work?
Feet.
To raise a house or other heavy machinery.
fulcrum- weight- effort
Direction - speed or size of the force applied.

35. What is the formula for the wheel and axle?
A modification of an inclined plane.
Equals the weight of the object being hoisted.
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
your arm.

36. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
1
fulcrum- weight- effort
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.

37. The bevel gear is used to connect what?
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.
45
Shafts lying at any given angle.

38. What is the first thing a gear can do?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Can change the direction of motion.
Door knob.
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. What direction does the effort and resistance move in first class levers?
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.
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

40. The miter gear faces are beveled at what angle?
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45
Opposite.

41. hat is a screw?
your arm.
1
A modification of an inclined plane.
To speed up the motion of resistence.

42. 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
fulcrum- weight- 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.
In pounds.

43. An egg beater has a mechanical advantage of what?
In Horsepower.
Same.
your arm.
Less than 1.

44. What is the second thing a gear can do?
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort

45. Fractional mechanical advantage
Can change the direction of motion.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.

46. What type of lever provides a fractional mechanical advantage?
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4
Third class lever.
To raise a house or other heavy machinery.

47. With a single fixed sheave what is the only mechanical advantage?
fulcrum- weight- effort
Door knob.
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.

48. What is the jack screw used for?
Power=Work/Time
To raise a house or other heavy machinery.
Less than 1.
A few thousandths of an inch.

49. What is the formula for the mechanical advantage of a screw?
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
2(pie)/pitch
A screw and a spur gear.

50. Class two lever
Equals the weight of the object being hoisted.
fulcrum- weight- effort
32/8 = 4
Wheel and axle.