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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. Gears can do a job for you by changing what three things?
Increase or decrease the the speed of the applied motion.
In pounds.
Direction - speed or size of the force applied.
Can change the direction of motion.

2. 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.
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
Power=Work/Time

3. The threads of a screw are cut so?
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
A modification of an inclined plane.

4. What is the theoretical mechanical advantage of any gear train?
Work=Force*Distance
A modification of an inclined plane.
Wheel and axle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

5. What is the formula for the wheel and axle?
A screw and a spur gear.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.
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

6. The miter gear faces are beveled at what angle?
your arm.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

7. How is force measured in work?
In pounds.
Equals the weight of the object being hoisted.
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.

8. Fractional mechanical advantage
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In Horsepower.

9. What is the ratio of any gear train?
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
Length of ramp/length of height from floor to truck
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

10. The worm gear is a combination of what?
Same.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
In pounds.

11. What is an example of a third class lever?
your arm.
A screw and a spur gear.
Same.
Same.

12. The bevel gear is used to connect what?
Shafts lying at any given angle.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
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.

13. How do you measure power?
In Horsepower.
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
Direction - speed or size of the force applied.

14. What is the jack screw used for?
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.
Same.

15. What type of lever provides a fractional mechanical advantage?
To speed up the motion of resistence.
Less than 1.
Third class lever.
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

16. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
45
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Same.

17. Class two lever
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.

18. What are the 4 forces?
To magnify the applied force.
45
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil

19. A miter gear connects what?
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

20. What direction does the effort and resistance move in the second class levers?
2(pie)/pitch
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.
Same.

21. What is the second thing a gear can do?
Power=Work/Time
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.

22. 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?
2(pie)/pitch
32/8 = 4
Connects shafts having a 90 degree angle.
Door knob.

23. What is the power formula?
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.

24. What is the purpose of a third class lever?
Opposite.
Feet.
To speed up the motion of resistence.
Wheel and axle.

25. What direction does the effort and resistance move in third class levers.
Can change the direction of motion.
Same.
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.

26. hat is a screw?
Length of ramp/length of height from floor to truck
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Work=Force*Distance
A modification of an inclined plane.

27. What is another way to find the mechanical advantage of an inclined plane?
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.
Length of ramp/length of height from floor to truck
In pounds.

28. How is distance measured in work?
Work=Force*Distance
Connects shafts having a 90 degree angle.
Can change the direction of motion.
Feet.

29. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Mechanical disadvantage. Use more force than the force of the load you lift.
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

30. How can you figure out the mechanical advantage of most block and falls by glance?
Less than 1.
Equals the weight of the object being hoisted.
Door knob.
Count the number of parts of the rope going to and from the movable block.

31. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Feet.
In pounds.
fulcrum- weight- effort

32. What is the first thing a gear can do?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
Can change the direction of motion.
A screw and a spur gear.

33. With a single fixed sheave what is the only mechanical advantage?
In Horsepower.
Magnify or reduce the force which you apply.
Simple machine
The change of the direction of the pull.

34. Work is measured in units also known as?
Feet.
1
Wheel and axle.
Foot- pounds

35. What kind of mechanical advantage does the first and second class lever provide?
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
2(pie)/pitch
Positive mechanical advantage.

36. 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.
Equals the weight of the object being hoisted.
A few thousandths of an inch.
fulcrum- weight- effort

37. An egg beater has a mechanical advantage of what?
Length of ramp/length of height from floor to truck
Less than 1.
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

38. Formula for fractional mechanical disadvantage.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
With oil - grease or soap.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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

40. What is the mechanical advantage of a single movable block?
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.
Feet.
To magnify the applied force.

41. Friction is involved when?
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Two surfaces move against one another.
32/8 = 4

42. How can you decrease friction on flat surfaces?
Increase or decrease the the speed of the applied motion.
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
With oil - grease or soap.

43. What kind of machine is the inclined plane?
Opposite.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine

44. What is another example of a wheel and axle?
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
Door knob.
1

45. What is one type of second class lever?
Wheel and axle.
2(pie)/pitch
A screw and a spur gear.
Power=Work/Time

46. 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.
2. Each half of the rope carries an equal amount of weight.
Same.
A modification of an inclined plane.

47. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Positive mechanical advantage.
Third class lever.
Magnify or reduce the force which you apply.

48. What is the mechanical advantage for a single fixed block?
1
Positive mechanical advantage.
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

49. What are first and third class levers used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
In Horsepower.

50. What direction does the effort and resistance move in first class levers?
Wheel and axle.
Shafts lying at any given angle.
Opposite.
Increase or decrease the the speed of the applied motion.