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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?
Door knob.
Same.
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.

2. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.

3. How can you decrease friction on flat surfaces?
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.
In Horsepower.

4. The worm gear is a combination of what?
A screw and a spur gear.
Wheel and axle.
Shafts lying at any given angle.
Same.

5. What is an example of a third class lever?
your arm.
Same.
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

6. What does a micrometer measure?
Same.
A few thousandths of an inch.
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.
In pounds.

7. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Direction - speed or size of the force applied.
Can change the direction of motion.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

8. What is another example of a wheel and axle?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.
Less than 1.
Equals the weight of the object being hoisted.

9. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
your arm.
Foot- pounds

10. hat is a screw?
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
Wheel and axle.
Positive mechanical advantage.

11. An egg beater has a mechanical advantage of what?
your arm.
Third class lever.
Less than 1.
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.

12. Friction is involved when?
45
Less than 1.
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil

13. What is the mechanical advantage of a single movable block?
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The force used to overcome friction is greater than the force used to do useful work.

14. What is the purpose of a third class lever?
Power=Work/Time
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.

15. What are first and third class levers used for?
1
The change of the direction of the pull.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.

16. How is work done?
Mechanical disadvantage. Use more force than the force of the load you lift.
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.

17. What is the formula for the mechanical advantage of a screw?
Connects shafts having a 90 degree angle.
2(pie)/pitch
Third class lever.
your arm.

18. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

19. How is distance measured in work?
To magnify the applied force.
Feet.
32/8 = 4
Direction - speed or size of the force applied.

20. How do you find the mechanical advantage?
Length of ramp/length of height from floor to truck
fulcrum- weight- 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.
The force used to overcome friction is greater than the force used to do useful work.

21. 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.
1
A screw and a spur gear.
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.

22. 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.
Door knob.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.

23. What is the power formula?
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
Power=Work/Time
Wheel and axle.

24. What kind of machine is the inclined plane?
A screw and a spur gear.
your arm.
Simple machine
2. Each half of the rope carries an equal amount of weight.

25. What direction does the effort and resistance move in the second class levers?
To magnify the applied force.
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
Foot- pounds

26. How can you figure out the mechanical advantage of most block and falls by glance?
Simple machine
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
Feet.

27. With a single fixed sheave what is the only mechanical advantage?
32/8 = 4
Can change the direction of motion.
Connects shafts having a 90 degree angle.
The change of the direction of the pull.

28. 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?
In pounds.
2(pie)/pitch
32/8 = 4
Less than 1.

29. How do you measure power?
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.

30. What are the 4 forces?
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.
Simple machine

31. The miter gear faces are beveled at what angle?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
A modification of an inclined plane.
45

32. What is the second thing a gear can do?
The change of the direction of the pull.
Length of ramp/length of height from floor to truck
Door knob.
Increase or decrease the the speed of the applied motion.

33. What direction does the effort and resistance move in third class levers.
In pounds.
Door knob.
Increase or decrease the the speed of the applied motion.
Same.

34. A miter gear connects what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.
Third class lever.
32/8 = 4

35. What direction does the effort and resistance move in first class levers?
Opposite.
2. Each half of the rope carries an equal amount of weight.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time

36. How is force measured in work?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch
In pounds.
Wheel and axle.

37. What is the work formula?
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance

38. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Feet.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

39. What is the first thing a gear can do?
32/8 = 4
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

40. 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.
Less than 1.
Equals the weight of the object being hoisted.
your arm.

41. Class two lever
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.
32/8 = 4
fulcrum- weight- effort

42. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

43. What is the mechanical advantage for a single fixed block?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.

44. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.

45. Fractional mechanical advantage
Door knob.
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
To speed up the motion of resistence.

46. What is the ratio of any gear train?
Shafts lying at any given angle.
In Horsepower.
your arm.
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 type of lever provides a fractional mechanical advantage?
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Third class lever.

48. What is the formula for the wheel and axle?
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
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.

49. What is the third thing a gear can do?
Power=Work/Time
Shafts lying at any given angle.
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

50. The bevel gear is used to connect what?
Connects shafts having a 90 degree angle.
Power=Work/Time
Shafts lying at any given angle.
To magnify the applied force.