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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.
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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. Friction is involved when?
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.

2. How do you find the mechanical advantage?
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.
To raise a house or other heavy machinery.
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.

3. Formula for fractional mechanical disadvantage.
Power=Work/Time
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
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.

4. The miter gear faces are beveled at what angle?
Increase or decrease the the speed of the applied motion.
45
fulcrum- weight- effort
Same.

5. What is the formula for the mechanical advantage of a screw?
fulcrum- weight- effort
2(pie)/pitch
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.

6. What direction does the effort and resistance move in first class levers?
Third class lever.
Opposite.
Wheel and axle.
1

7. What is the first thing a gear can do?
The change of the direction of the pull.
Can change the direction of motion.
Wheel and axle.
Length of ramp/length of height from floor to truck

8. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
Foot- pounds
Positive mechanical advantage.

9. What is the mechanical advantage for a single fixed block?
Third class lever.
To speed up the motion of resistence.
Positive mechanical advantage.
1

10. What kind of machine is the inclined plane?
Simple machine
fulcrum- weight- effort
Direction - speed or size of the force applied.
Shafts lying at any given angle.

11. With a single fixed sheave what is the only mechanical advantage?
2(pie)/pitch
The change of the direction of the pull.
Can change the direction of motion.
A few thousandths of an inch.

12. Gears can do a job for you by changing what three things?
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.
Direction - speed or size of the force applied.

13. Class two lever
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.
fulcrum- weight- effort
Door knob.

14. What is the purpose of a third class lever?
Less than 1.
To speed up the motion of resistence.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

15. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.

16. What is the second thing a gear can do?
Same.
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.
Increase or decrease the the speed of the applied motion.

17. hat is a screw?
A modification of an inclined plane.
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.

18. How is distance measured in work?
To raise a house or other heavy machinery.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.
Feet.

19. What is the formula for the wheel and axle?
When a resistance is overcome by a force acting through a measurable distance.
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
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch

20. What is an example of a third class lever?
Simple machine
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
Two surfaces move against one another.

21. What does a micrometer measure?
Foot- pounds
your arm.
In Horsepower.
A few thousandths of an inch.

22. What is the work formula?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
Simple machine
To magnify the applied force.

23. What is another example of a wheel and axle?
Door knob.
Direction - speed or size of the force applied.
In Horsepower.
2. Each half of the rope carries an equal amount of weight.

24. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Third class lever.
Count the number of parts of the rope going to and from the movable block.

25. 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.
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.
To raise a house or other heavy machinery.
Same.

26. What is the lever formula?
Third class lever.
With oil - grease or soap.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time

27. Work is measured in units also known as?
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.
Positive mechanical advantage.
Foot- pounds

28. Fractional mechanical advantage
Positive mechanical advantage.
A few thousandths of an inch.
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.

29. How is force measured in work?
In pounds.
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.

30. What type of lever provides a fractional mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds
Third class lever.
45

31. What direction does the effort and resistance move in the second class levers?
Two surfaces move against one another.
Same.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

32. What is the mechanical advantage of a single movable block?
Magnify or reduce the force which you apply.
Two surfaces move against one another.
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
2. Each half of the rope carries an equal amount of weight.

33. 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.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.

34. 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?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
32/8 = 4

35. How can you decrease friction on flat surfaces?
Connects shafts having a 90 degree angle.
With oil - grease or soap.
Less than 1.
2. Each half of the rope carries an equal amount of weight.

36. What are first and third class levers used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
1
To magnify the applied force.

37. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Less than 1.
Positive mechanical advantage.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.

38. What direction does the effort and resistance move in third class levers.
Power=Work/Time
Same.
In pounds.
To magnify the applied force.

39. The bevel gear is used to connect what?
Simple machine
32/8 = 4
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
Shafts lying at any given angle.

40. What is one type of second class lever?
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.

41. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
32/8 = 4
Length of ramp/length of height from floor to truck
In Horsepower.

42. What are the 4 forces?
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
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
Gravity - Magnetism - Friction - Recoil

43. What is the third thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

44. How do you measure power?
In Horsepower.
Door knob.
Same.
fulcrum- weight- effort

45. A miter gear connects what?
Opposite.
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
Door knob.

46. The worm gear is a combination of what?
A screw and a spur gear.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.

47. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
With oil - grease or soap.

48. What is another way to find the mechanical advantage of an inclined plane?
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck

49. An egg beater has a mechanical advantage of what?
Less than 1.
Positive mechanical advantage.
Foot- pounds
Same.

50. What is the power formula?
Feet.
Can change the direction of motion.
Power=Work/Time
In Horsepower.