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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 kind of machine is the inclined plane?
Same.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
Simple machine

2. Class two lever
In pounds.
A screw and a spur gear.
32/8 = 4
fulcrum- weight- effort

3. A miter gear connects what?
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
Work=Force*Distance
Opposite.

4. How can you figure out the mechanical advantage of most block and falls by glance?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.

5. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Simple machine

6. What is the jack screw used for?
Door knob.
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.

7. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.

8. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
your arm.
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

9. What is the mechanical advantage for a single fixed block?
Door knob.
fulcrum- weight- effort
1
The rope that passes through your hands is greater than the distance that the load is raised.

10. How can you decrease friction on flat surfaces?
With oil - grease or soap.
In pounds.
Positive mechanical advantage.
45

11. The worm gear is a combination of what?
Feet.
Direction - speed or size of the force applied.
The change of the direction of the pull.
A screw and a spur gear.

12. What is the first thing a gear can do?
Can change the direction of motion.
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

13. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
your arm.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.

14. Friction is involved when?
your arm.
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
Same.

15. What direction does the effort and resistance move in third class levers.
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Direction - speed or size of the force applied.
Same.

16. hat is a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
A modification of an inclined plane.
your arm.

17. What is the mechanical advantage of a single movable block?
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.

18. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
With oil - grease or soap.
In Horsepower.
2. Each half of the rope carries an equal amount of weight.

19. How do you measure power?
In Horsepower.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
Connects shafts having a 90 degree angle.

20. What direction does the effort and resistance move in first class levers?
Opposite.
A modification of an inclined plane.
Door knob.
1

21. What is the purpose of a third class lever?
In Horsepower.
To speed up the motion of resistence.
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
Increase or decrease the the speed of the applied motion.

22. How do you find the mechanical advantage?
Third class lever.
32/8 = 4
A screw and a spur gear.
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.

23. What is the ratio of any gear train?
Connects shafts having a 90 degree angle.
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 change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

24. What is one type of second class lever?
When a resistance is overcome by a force acting through a measurable 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.
2(pie)/pitch
Wheel and axle.

25. What is the formula for the wheel and axle?
Simple machine
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
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

26. What is the second thing a gear can do?
With oil - grease or soap.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.

27. The miter gear faces are beveled at what angle?
2(pie)/pitch
45
Foot- pounds
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

28. What are first and third class levers used for?
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.
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.

29. Fractional mechanical advantage
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.
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.

30. What is the formula for the mechanical advantage of a screw?
In Horsepower.
Positive mechanical advantage.
2(pie)/pitch
Equals the weight of the object being hoisted.

31. What is the work formula?
2(pie)/pitch
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance

32. How is distance measured in work?
Positive mechanical advantage.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.

33. With a single fixed sheave what is the only mechanical advantage?
Magnify or reduce the force which you apply.
Opposite.
The change of the direction of the pull.
A screw and a spur gear.

34. What kind of mechanical advantage does the first and second class lever provide?
45
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.
Positive mechanical advantage.

35. What is the power formula?
Door knob.
Count the number of parts of the rope going to and from the movable block.
Same.
Power=Work/Time

36. Gears can do a job for you by changing what three things?
Count the number of parts of the rope going to and from the movable block.
Opposite.
Direction - speed or size of the force applied.
Third class lever.

37. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
In pounds.
Can change the direction of motion.
Direction - speed or size of the force applied.

38. How is force measured in work?
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.
Connects shafts having a 90 degree angle.
In pounds.

39. What is another example of a wheel and axle?
Same.
A screw and a spur gear.
Work=Force*Distance
Door knob.

40. What direction does the effort and resistance move in the second class levers?
Power=Work/Time
Same.
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort

41. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.
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.
Length of ramp/length of height from floor to truck

42. 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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.
your arm.

43. 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?
The force used to overcome friction is greater than the force used to do useful work.
Shafts lying at any given angle.
32/8 = 4
Length of ramp/length of height from floor to truck

44. What does a micrometer measure?
Work=Force*Distance
A few thousandths of an inch.
In pounds.
With oil - grease or soap.

45. The threads of a screw are cut so?
Length of ramp/length of height from floor to truck
Less than 1.
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.

46. An egg beater has a mechanical advantage of what?
Equals the weight of the object being hoisted.
With oil - grease or soap.
To magnify the applied force.
Less than 1.

47. Work is measured in units also known as?
The change of the direction of the pull.
Foot- pounds
your arm.
Opposite.

48. How is work done?
1
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

49. The bevel gear is used to connect what?
Shafts lying at any given angle.
1
Work=Force*Distance
A screw and a spur gear.

50. What type of lever provides a fractional mechanical advantage?
In Horsepower.
To speed up the motion of resistence.
Same.
Third class lever.