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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. How do you measure power?
Increase or decrease the the speed of the applied motion.
Less than 1.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.

2. What is an example of a third class lever?
Equals the weight of the object being hoisted.
A screw and a spur gear.
Less than 1.
your arm.

3. How is work done?
A screw and a spur gear.
1
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.

4. What is the ratio of any gear train?
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

5. What are first and third class levers used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
To magnify the applied force.
Same.

6. What kind of machine is the inclined plane?
Simple machine
1
Connects shafts having a 90 degree angle.
Same.

7. What is the second thing a gear can do?
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.
your arm.
A screw and a spur gear.

8. The threads of a screw are cut so?
Count the number of parts of the rope going to and from the movable block.
Same.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.

9. What is another way to find the mechanical advantage of an inclined plane?
1
Third class lever.
Length of ramp/length of height from floor to truck
A few thousandths of an inch.

10. How can you figure out the mechanical advantage of most block and falls by glance?
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
your arm.
1

11. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
Wheel and axle.

12. What is the work formula?
A screw and a spur gear.
Foot- pounds
Work=Force*Distance
Can change the direction of motion.

13. hat is a screw?
To magnify the applied force.
Less than 1.
A modification of an inclined plane.
Same.

14. Work is measured in units also known as?
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.

15. What is the formula for the mechanical advantage of a screw?
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.
2(pie)/pitch

16. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
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.

17. What kind of mechanical advantage does the first and second class lever provide?
In pounds.
Positive mechanical advantage.
Power=Work/Time
45

18. How do you find the mechanical advantage?
Less than 1.
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.
Magnify or reduce the force which you apply.

19. Friction is involved when?
fulcrum- weight- effort
To speed up the motion of resistence.
Two surfaces move against one another.
Simple machine

20. What is the third thing a gear can do?
Same.
Magnify or reduce the force which you apply.
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.

21. How can you decrease friction on flat surfaces?
32/8 = 4
With oil - grease or soap.
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.

22. What type of lever provides a fractional 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.
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
Third class lever.

23. What is the purpose of a third class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
Simple machine

24. A miter gear connects what?
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.
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

25. What is the theoretical mechanical advantage of any gear train?
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.
Magnify or reduce the force which you apply.
your arm.

26. What is another example of a wheel and axle?
Door knob.
Third class lever.
Direction - speed or size of the force applied.
your arm.

27. The worm gear is a combination of what?
Door knob.
Connects shafts having a 90 degree angle.
Less than 1.
A screw and a spur gear.

28. Fractional mechanical advantage
Shafts lying at any given angle.
Direction - speed or size of the force applied.
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.

29. What direction does the effort and resistance move in third class levers.
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
Wheel and axle.
A modification of an inclined plane.

30. Formula for fractional mechanical disadvantage.
A modification of an inclined plane.
Length of ramp/length of height from floor to truck
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

31. What does a micrometer measure?
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
A few thousandths of an inch.
To speed up the motion of resistence.

32. The miter gear faces are beveled at what angle?
1
Direction - speed or size of the force applied.
45
Equals the weight of the object being hoisted.

33. 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
45
Increase or decrease the the speed of the applied motion.
In Horsepower.

34. What is the power formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
32/8 = 4
Power=Work/Time
2(pie)/pitch

35. How is distance measured in work?
To speed up the motion of resistence.
In pounds.
Feet.
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

36. What direction does the effort and resistance move in first class levers?
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time

37. Gears can do a job for you by changing what three things?
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
fulcrum- weight- effort

38. Class two lever
Simple machine
fulcrum- weight- effort
Equals the weight of the object being hoisted.
With oil - grease or soap.

39. An egg beater has a mechanical advantage of what?
When a resistance is overcome by a force acting through a measurable distance.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.

40. What is one type of second class lever?
A modification of an inclined plane.
Wheel and axle.
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.

41. How is force measured in work?
Less than 1.
Shafts lying at any given angle.
Work=Force*Distance
In pounds.

42. What is the mechanical advantage for a single fixed block?
Same.
1
To speed up the motion of resistence.
Magnify or reduce the force which you apply.

43. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
When a resistance is overcome by a force acting through a measurable distance.
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.

44. What is the jack screw used for?
Foot- pounds
To raise a house or other heavy machinery.
Simple machine
Shafts lying at any given angle.

45. What is the first thing a gear can do?
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.
Can change the direction of motion.

46. What is the mechanical advantage of a single movable block?
In Horsepower.
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.

47. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

48. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
Feet.

49. What is the formula for the wheel and axle?
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
With oil - grease or soap.
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

50. What direction does the effort and resistance move in the second class levers?
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
Same.
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.