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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. 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
To raise a house or other heavy machinery.
your arm.
In Horsepower.

2. 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
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.

3. What is the jack screw used for?
Same.
To raise a house or other heavy machinery.
In Horsepower.
Work=Force*Distance

4. What is the power formula?
Work=Force*Distance
2(pie)/pitch
Power=Work/Time
Third class lever.

5. What is an example of a third class lever?
Two surfaces move against one another.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
your arm.

6. How do you find the mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
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.
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.

7. What type of lever provides a fractional mechanical advantage?
The change of the direction of the pull.
A few thousandths of an inch.
Opposite.
Third class lever.

8. What is the lever formula?
Foot- pounds
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.
Door knob.

9. The miter gear faces are beveled at what angle?
Gravity - Magnetism - Friction - Recoil
45
Simple machine
Less than 1.

10. What is the mechanical advantage of a single movable block?
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.

11. What is the purpose of a 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.
To speed up the motion of resistence.
Door knob.
Simple machine

12. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
With oil - grease or soap.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

13. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
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

14. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A modification of an inclined plane.
In pounds.
A screw and a spur gear.
Equals the weight of the object being hoisted.

15. How is force measured in work?
Same.
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.

16. Work is measured in units also known as?
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
In Horsepower.

17. What is the work formula?
In pounds.
Wheel and axle.
Work=Force*Distance
To raise a house or other heavy machinery.

18. What direction does the effort and resistance move in the second class levers?
Direction - speed or size of the force applied.
Same.
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.

19. What direction does the effort and resistance move in first class levers?
Opposite.
1
Wheel and axle.
A screw and a spur gear.

20. Fractional mechanical advantage
Simple machine
Wheel and axle.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.

21. How is work done?
Can change the direction of motion.
1
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort

22. How is distance measured in work?
Magnify or reduce the force which you apply.
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.
Feet.
Power=Work/Time

23. What kind of machine is the inclined plane?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Less than 1.
Magnify or reduce the force which you apply.

24. How can you figure out the mechanical advantage of most block and falls by glance?
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
Equals the weight of the object being hoisted.

25. A miter gear connects what?
Connects shafts having a 90 degree angle.
A screw and a spur gear.
Can change the direction of motion.
In pounds.

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

27. What is another way to find the mechanical advantage of an inclined plane?
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.

28. Formula for fractional mechanical disadvantage.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.

29. What is another example of a wheel and axle?
Two surfaces move against one another.
Power=Work/Time
Foot- pounds
Door knob.

30. Friction is involved when?
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.

31. The threads of a screw are cut so?
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
Can change the direction of motion.
To raise a house or other heavy machinery.

32. How do you measure power?
Length of ramp/length of height from floor to truck
In Horsepower.
In pounds.
Direction - speed or size of the force applied.

33. Gears can do a job for you by changing what three things?
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
Direction - speed or size of the force applied.

34. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.

35. What is the mechanical advantage for a single fixed block?
Direction - speed or size of the force applied.
1
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

36. Class two lever
fulcrum- weight- effort
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
The rope that passes through your hands is greater than the distance that the load is raised.

37. The bevel gear is used to connect what?
Same.
To magnify the applied force.
Shafts lying at any given angle.
1

38. An egg beater has a mechanical advantage of what?
Magnify or reduce the force which you apply.
To magnify the applied force.
The change of the direction of the pull.
Less than 1.

39. What is one type of second class lever?
Wheel and axle.
1
Foot- pounds
Shafts lying at any given angle.

40. What is the ratio of any gear train?
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.
To speed up the motion of resistence.
Power=Work/Time

41. What is the third thing a gear can do?
Same.
Magnify or reduce the force which you apply.
45
Gravity - Magnetism - Friction - Recoil

42. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
Same.
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

43. hat is a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
The change of the direction of the pull.
A modification of an inclined plane.

44. The worm gear is a combination of what?
Feet.
A screw and a spur gear.
With oil - grease or soap.
Simple machine

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

46. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.
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.

47. What is the formula for the mechanical advantage of a screw?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
Feet.
Door knob.

48. How can you decrease friction on flat surfaces?
Simple machine
In pounds.
2(pie)/pitch
With oil - grease or soap.

49. What does a micrometer measure?
Connects shafts having a 90 degree angle.
Wheel and axle.
Magnify or reduce the force which you apply.
A few thousandths of an inch.

50. What is the theoretical mechanical advantage of any gear train?
A screw and a spur gear.
In Horsepower.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.