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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. An egg beater has a mechanical advantage of what?
Feet.
Less than 1.
Third class lever.
To raise a house or other heavy machinery.

2. What is the purpose of a 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.
To speed up the motion of resistence.
Shafts lying at any given angle.
A screw and a spur gear.

3. A miter gear connects 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
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.

4. What is the first thing a gear can do?
Connects shafts having a 90 degree angle.
Can change the direction of motion.
45
A screw and a spur gear.

5. Gears can do a job for you by changing what three things?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1
Direction - speed or size of the force applied.

6. How can you figure out the mechanical advantage of most block and falls by glance?
Same.
your arm.
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.

7. What kind of mechanical advantage does the first and second class lever provide?
To raise a house or other heavy machinery.
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
Positive mechanical advantage.
The change of the direction of the pull.

8. What direction does the effort and resistance move in first class levers?
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
In pounds.
Increase or decrease the the speed of the applied motion.

9. What is the ratio of any gear train?
Gravity - Magnetism - Friction - Recoil
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Door knob.

10. What is the mechanical advantage for a single fixed block?
Work=Force*Distance
To raise a house or other heavy machinery.
45
1

11. 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
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
Less than 1.

12. Friction is involved when?
Simple machine
Two surfaces move against one another.
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

13. How can you decrease friction on flat surfaces?
With oil - grease or soap.
A few thousandths of an inch.
Third class lever.
1

14. What is another way to find the mechanical advantage of an inclined plane?
In Horsepower.
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
Door knob.

15. The bevel gear is used to connect what?
Same.
Less than 1.
Power=Work/Time
Shafts lying at any given angle.

16. What is another example of a wheel and axle?
2. Each half of the rope carries an equal amount of weight.
Same.
Door knob.
1

17. What is the formula for the mechanical advantage of a screw?
32/8 = 4
2(pie)/pitch
Length of ramp/length of height from floor to truck
Foot- pounds

18. How is distance measured in work?
Simple machine
Foot- pounds
Feet.
Less than 1.

19. Formula for fractional mechanical disadvantage.
Connects shafts having a 90 degree angle.
Door knob.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

20. What is the work formula?
Two surfaces move against one another.
Work=Force*Distance
A screw and a spur gear.
Door knob.

21. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

22. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
In pounds.
Equals the weight of the object being hoisted.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.

23. What is the power formula?
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time

24. Work is measured in units also known as?
Foot- pounds
Two surfaces move against one another.
The change of the direction of the pull.
your arm.

25. What is an example of a third class lever?
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.
1
The rope that passes through your hands is greater than the distance that the load is raised.

26. What is the third thing a gear can do?
The change of the direction of the pull.
Same.
Foot- pounds
Magnify or reduce the force which you apply.

27. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

28. How do you measure power?
Magnify or reduce the force which you apply.
In Horsepower.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.

29. What kind of machine is the inclined plane?
Simple machine
Door knob.
A few thousandths of an inch.
Can change the direction of motion.

30. What is the second thing a gear can do?
Wheel and axle.
Power=Work/Time
Increase or decrease the the speed of the applied motion.
Count the number of parts of the rope going to and from the movable block.

31. What type of lever provides a fractional mechanical advantage?
Third class lever.
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
To speed up the motion of resistence.

32. The miter gear faces are beveled at what angle?
Simple machine
45
Same.
To raise a house or other heavy machinery.

33. With a single fixed sheave what is the only mechanical advantage?
your arm.
Door knob.
Feet.
The change of the direction of the pull.

34. What is the theoretical mechanical advantage of any gear train?
Shafts lying at any given angle.
Same.
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

35. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
Feet.
To magnify the applied force.
Same.

36. 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?
Connects shafts having a 90 degree angle.
32/8 = 4
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.

37. How is force measured in work?
In pounds.
Opposite.
With oil - grease or soap.
A few thousandths of an inch.

38. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.
Opposite.
your arm.

39. What are first and third class levers used for?
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.
To magnify the applied force.
Feet.

40. The worm gear is a combination of what?
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.
Feet.

41. How do you find the mechanical advantage?
Direction - speed or size of the force applied.
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.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

42. What does a micrometer measure?
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch

43. What direction does the effort and resistance move in the second class levers?
Gravity - Magnetism - Friction - Recoil
Same.
Wheel and axle.
Simple machine

44. What are the 4 forces?
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Gravity - Magnetism - Friction - Recoil
Same.

45. What is one type of second class lever?
A modification of an inclined plane.
Two surfaces move against one another.
Opposite.
Wheel and axle.

46. hat is a screw?
Door knob.
Gravity - Magnetism - Friction - Recoil
Feet.
A modification of an inclined plane.

47. Class two lever
To magnify the applied force.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort
2(pie)/pitch

48. 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.
1
A few thousandths of an inch.

49. What is the jack screw used for?
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.
In pounds.
To raise a house or other heavy machinery.

50. Fractional mechanical advantage
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
A screw and a spur gear.