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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 is distance measured in work?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A screw and a spur gear.
Length of ramp/length of height from floor to truck
Feet.

2. What is one type of second class lever?
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
Feet.
Two surfaces move against one another.

3. What are the 4 forces?
A screw and a spur gear.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil

4. What is another way to find the mechanical advantage of an inclined plane?
Gravity - Magnetism - Friction - Recoil
45
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.

5. The worm gear is a combination of what?
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.
Can change the direction of motion.

6. hat is a screw?
Same.
A modification of an inclined plane.
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
When a resistance is overcome by a force acting through a measurable distance.

7. What is the work formula?
A screw and a spur gear.
Work=Force*Distance
A few thousandths of an inch.
Can change the direction of motion.

8. Fractional mechanical advantage
Equals the weight of the object being hoisted.
To magnify the applied force.
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.

9. What is an example of a third class lever?
Feet.
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.

10. How can you decrease friction on flat surfaces?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
Feet.

11. What is the mechanical advantage for a single fixed block?
Same.
1
Door knob.
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. A miter gear connects what?
Connects shafts having a 90 degree angle.
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
32/8 = 4

13. 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.
A screw and a spur gear.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

14. Class two lever
fulcrum- weight- effort
Connects shafts having a 90 degree angle.
In Horsepower.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

15. What is the first thing a gear can do?
Can change the direction of motion.
To magnify the applied force.
Door knob.
Third class lever.

16. What is the second 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.
Wheel and axle.
1
Increase or decrease the the speed of the applied motion.

17. What is the formula for the mechanical advantage of a screw?
Third class lever.
Increase or decrease the the speed of the applied motion.
Door knob.
2(pie)/pitch

18. How can you figure out the mechanical advantage of most block and falls by glance?
The change of the direction of the pull.
Can change the direction of motion.
Third class lever.
Count the number of parts of the rope going to and from the movable block.

19. 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.
Two surfaces move against one another.

20. What is the purpose of a third class lever?
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.
Opposite.

21. What kind of mechanical advantage does the first and second class lever provide?
Same.
Power=Work/Time
Positive mechanical advantage.
A screw and a spur gear.

22. Formula for fractional mechanical disadvantage.
Connects shafts having a 90 degree angle.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.

23. The threads of a screw are cut so?
2(pie)/pitch
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

24. What are first and third class levers used for?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
Length of ramp/length of height from floor to truck
With oil - grease or soap.

25. 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.
Simple machine
Opposite.
2(pie)/pitch

26. What type of lever provides a fractional mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.

27. What is the lever formula?
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
Opposite.

28. What does a micrometer measure?
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

29. An egg beater has a mechanical advantage of what?
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.
Less than 1.
Third class lever.
In pounds.

30. How do you measure power?
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A screw and a spur gear.
In Horsepower.

31. What direction does the effort and resistance move in first class levers?
1
In pounds.
32/8 = 4
Opposite.

32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
your arm.
Power=Work/Time
Equals the weight of the object being hoisted.
Opposite.

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?
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.
In Horsepower.
32/8 = 4

34. What is another example of a wheel and axle?
In Horsepower.
1
Door knob.
Foot- pounds

35. How is force measured in work?
Can change the direction of motion.
fulcrum- weight- effort
In pounds.
A screw and a spur gear.

36. Friction is involved when?
Two surfaces move against one another.
Foot- pounds
To raise a house or other heavy machinery.
32/8 = 4

37. What direction does the effort and resistance move in the second class levers?
fulcrum- weight- effort
Direction - speed or size of the force applied.
Same.
Increase or decrease the the speed of the applied motion.

38. The bevel gear is used to connect what?
With oil - grease or soap.
Shafts lying at any given angle.
Simple machine
Door knob.

39. Work is measured in units also known as?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
1
Less than 1.
Foot- pounds

40. 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
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.
Same.

41. What direction does the effort and resistance move in third class levers.
fulcrum- weight- effort
1
Same.
Positive mechanical advantage.

42. What kind of machine is the inclined plane?
Positive mechanical advantage.
Simple machine
Wheel and axle.
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.

43. 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.
A modification of an inclined plane.
Same.

44. How is work done?
A few thousandths of an inch.
your arm.
When a resistance is overcome by a force acting through a measurable distance.
Feet.

45. What is the mechanical advantage of a single movable block?
Simple machine
2. Each half of the rope carries an equal amount of weight.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.

46. With a single fixed sheave what is the only 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.
To magnify the applied force.
The change of the direction of the pull.
Two surfaces move against one another.

47. What is the power formula?
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.

48. What is the jack screw used for?
The rope that passes through your hands is greater than the distance that the load is raised.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To raise a house or other heavy machinery.
1

49. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
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 is the ratio of any gear train?
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.
45
Increase or decrease the the speed of the applied motion.