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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. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
With oil - grease or soap.
The change of the direction of the pull.
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.

2. What is the mechanical advantage for a single fixed block?
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
1
32/8 = 4

3. What direction does the effort and resistance move in the second class levers?
Gravity - Magnetism - Friction - Recoil
Same.
Shafts lying at any given angle.
Two surfaces move against one another.

4. What is the third 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.
Magnify or reduce the force which you apply.
1
Equals the weight of the object being hoisted.

5. What direction does the effort and resistance move in third class levers.
A screw and a spur gear.
A few thousandths of an inch.
Same.
your arm.

6. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.
Wheel and axle.

7. What is the purpose of a third class lever?
1
Simple machine
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.

8. What is the jack screw used for?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.
1
To raise a house or other heavy machinery.

9. What is one type of second class lever?
Wheel and axle.
Two surfaces move against one another.
Can change the direction of motion.
45

10. hat is a screw?
A modification of an inclined plane.
Length of ramp/length of height from floor to truck
Wheel and axle.
Positive mechanical advantage.

11. The threads of a screw are cut so?
your arm.
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

12. How do you measure power?
In Horsepower.
Foot- pounds
fulcrum- weight- effort
Two surfaces move against one another.

13. What is another example of a wheel and axle?
Power=Work/Time
A screw and a spur gear.
A modification of an inclined plane.
Door knob.

14. What kind of mechanical advantage does the first and second class lever provide?
Equals the weight of the object being hoisted.
Positive mechanical advantage.
Foot- pounds
Magnify or reduce the force which you apply.

15. What is the ratio of any gear train?
Feet.
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.
In pounds.

16. Friction is involved when?
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
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
Two surfaces move against one another.

17. The worm gear is a combination of what?
Foot- pounds
Two surfaces move against one another.
A screw and a spur gear.
Power=Work/Time

18. How can you figure out the mechanical advantage of most block and falls by glance?
Feet.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.

19. What are the 4 forces?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
Simple machine

20. What is the formula for the mechanical advantage of a screw?
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
To raise a house or other heavy machinery.

21. How do you find the mechanical advantage?
Magnify or reduce the force which you apply.
The change of the direction of the pull.
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.
With oil - grease or soap.

22. What is the first thing a gear can do?
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.
Can change the direction of motion.
Same.

23. What does a micrometer measure?
45
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.

24. What is the power formula?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time
Work=Force*Distance
2(pie)/pitch

25. Fractional mechanical advantage
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.
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.

26. With a single fixed sheave what is the only mechanical advantage?
To speed up the motion of resistence.
The change of the direction of the pull.
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.

27. What is the formula for the wheel and axle?
With oil - grease or soap.
Third class lever.
Less than 1.
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

28. What kind of machine is the inclined plane?
Shafts lying at any given angle.
Simple machine
Third class lever.
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.

29. Formula for fractional mechanical disadvantage.
Foot- pounds
Positive mechanical advantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance

30. Work is measured in units also known as?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.

31. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Less than 1.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

32. What type of lever provides a fractional mechanical advantage?
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
45
Third class lever.

33. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
1
Simple machine

34. Class two lever
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort
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.

35. 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
A few thousandths of an inch.
To raise a house or other heavy machinery.
Power=Work/Time

36. What is the lever formula?
Shafts lying at any given angle.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

37. The miter gear faces are beveled at what angle?
45
fulcrum- weight- effort
32/8 = 4
To speed up the motion of resistence.

38. How is force measured in work?
Work=Force*Distance
Magnify or reduce the force which you apply.
Opposite.
In pounds.

39. What direction does the effort and resistance move in first class levers?
Opposite.
Work=Force*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.
Connects shafts having a 90 degree angle.

40. A miter gear connects what?
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
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.
Magnify or reduce the force which you apply.

41. An egg beater has a mechanical advantage of what?
Less than 1.
Opposite.
your arm.
With oil - grease or soap.

42. What is another way to find the mechanical advantage of an inclined plane?
Simple machine
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
Less than 1.
Length of ramp/length of height from floor to truck

43. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
To magnify the applied force.

44. What is the work formula?
Work=Force*Distance
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.

45. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Same.
Connects shafts having a 90 degree angle.
your arm.

46. What is the theoretical mechanical advantage of any gear train?
Foot- pounds
In pounds.
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

47. How is distance measured in work?
Magnify or reduce the force which you apply.
Same.
Feet.
Shafts lying at any given angle.

48. What is an example of a third class lever?
fulcrum- weight- effort
Magnify or reduce the force which you apply.
your arm.
Same.

49. 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.
A few thousandths of an inch.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.

50. Gears can do a job for you by changing what three things?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Direction - speed or size of the force applied.