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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. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.

2. An egg beater has a mechanical advantage of 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
32/8 = 4
Less than 1.
Equals the weight of the object being hoisted.

3. With a single fixed sheave what is the only mechanical advantage?
Same.
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.
The change of the direction of the pull.

4. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
2(pie)/pitch

5. What is the formula for the mechanical advantage of a screw?
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.

6. What is one type of second 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.
Wheel and axle.
To speed up the motion of resistence.
Simple machine

7. What is another example of a wheel and axle?
To magnify the applied force.
To speed up the motion of resistence.
Door knob.
Shafts lying at any given angle.

8. What are the 4 forces?
Same.
45
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil

9. How is work done?
Work=Force*Distance
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
Mechanical disadvantage. Use more force than the force of the load you lift.

10. How is force measured in work?
Direction - speed or size of the force applied.
In pounds.
Work=Force*Distance
Third class lever.

11. What direction does the effort and resistance move in first class levers?
The change of the direction of the pull.
Door knob.
Opposite.
In Horsepower.

12. What is the formula for the wheel and axle?
Positive mechanical advantage.
To magnify the applied force.
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.

13. What is the purpose of a third class lever?
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
1
fulcrum- weight- effort

14. What direction does the effort and resistance move in the second class levers?
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.
fulcrum- weight- effort
Mechanical disadvantage. Use more force than the force of the load you lift.

15. What is the theoretical mechanical advantage of any gear train?
fulcrum- weight- effort
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.
The force used to overcome friction is greater than the force used to do useful work.

16. What is the jack screw used for?
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
Opposite.

17. Work is measured in units also known as?
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Foot- pounds

18. What is the ratio of any gear train?
Equals the weight of the object being hoisted.
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
32/8 = 4

19. The miter gear faces are beveled at what angle?
45
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance

20. Class two lever
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Opposite.

21. What is the second thing a gear can do?
A modification of an inclined plane.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

22. How is distance measured in work?
To speed up the motion of resistence.
In Horsepower.
Feet.
Same.

23. What are first and third class levers used for?
Shafts lying at any given angle.
To magnify the applied force.
32/8 = 4
In pounds.

24. What kind of mechanical advantage does the first and second class lever provide?
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.
In Horsepower.
Gravity - Magnetism - Friction - Recoil

25. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.

26. What kind of machine is the inclined plane?
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Simple machine

27. What is the mechanical advantage of a single movable block?
To speed up the motion of resistence.
A screw and a spur gear.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.

28. What is the work formula?
In pounds.
Work=Force*Distance
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

29. hat is a screw?
Simple machine
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
A modification of an inclined plane.

30. The worm gear is a combination of what?
A screw and a spur gear.
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
In pounds.

31. What direction does the effort and resistance move in third class levers.
A screw and a spur gear.
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.

32. What is the lever formula?
Work=Force*Distance
Foot- pounds
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

33. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Simple machine
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

34. What is the mechanical advantage for a single fixed block?
A screw and a spur gear.
1
The change of the direction of the pull.
Door knob.

35. A miter gear connects what?
Positive mechanical advantage.
A modification of an inclined plane.
32/8 = 4
Connects shafts having a 90 degree angle.

36. The threads of a screw are cut so?
Same.
A screw and a spur gear.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.

37. How can you figure out the mechanical advantage of most block and falls by glance?
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.
Count the number of parts of the rope going to and from the movable block.
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

38. The bevel gear is used to connect what?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.
Shafts lying at any given angle.
To magnify the applied force.

39. 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
Opposite.
1
To speed up the motion of resistence.

40. 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.
Work=Force*Distance
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.

41. Gears can do a job for you by changing what three things?
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.
Door knob.

42. What is an example 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.
Positive mechanical advantage.
your arm.
Feet.

43. How do you measure power?
In Horsepower.
Work=Force*Distance
Power=Work/Time
Foot- pounds

44. Friction is involved when?
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.
The change of the direction of the pull.
45

45. What does a micrometer measure?
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
A screw and a spur gear.
Can change the direction of motion.

46. Fractional mechanical advantage
To raise a house or other heavy machinery.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.

47. What is the power formula?
Power=Work/Time
Gravity - Magnetism - Friction - Recoil
Same.
A few thousandths of an inch.

48. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

49. What is the first thing a gear can do?
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 raise a house or other heavy machinery.
Can change the direction of motion.
Shafts lying at any given angle.

50. What is the third thing a gear can do?
Positive mechanical advantage.
Magnify or reduce the force which you apply.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil