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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. What is the power formula?
1
Power=Work/Time
Wheel and axle.
To raise a house or other heavy machinery.

2. What kind of mechanical advantage does the first and second class lever provide?
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
Positive mechanical advantage.

3. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance
Same.
1

4. Fractional mechanical advantage
Same.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.

5. What direction does the effort and resistance move in first class levers?
Equals the weight of the object being hoisted.
Work=Force*Distance
Length of ramp/length of height from floor to truck
Opposite.

6. hat is a screw?
Third class lever.
45
1
A modification of an inclined plane.

7. How do you measure power?
Positive mechanical advantage.
In Horsepower.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.

8. How is force measured in work?
In pounds.
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.

9. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Wheel and axle.
1
2(pie)/pitch

10. What direction does the effort and resistance move in the second class levers?
Wheel and axle.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.

11. What type of lever provides a fractional mechanical advantage?
In Horsepower.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

12. How can you decrease friction on flat surfaces?
Connects shafts having a 90 degree angle.
With oil - grease or soap.
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.

13. How do you find the mechanical advantage?
Shafts lying at any given 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.
fulcrum- weight- effort
Door knob.

14. The miter gear faces are beveled at what angle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
45
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck

15. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
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
45

16. With a single fixed sheave what is the only mechanical advantage?
Wheel and axle.
The change of the direction of the pull.
45
Gravity - Magnetism - Friction - Recoil

17. What does a micrometer measure?
A modification of an inclined plane.
A few thousandths of an inch.
Door knob.
Opposite.

18. The threads of a screw are cut so?
Door knob.
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

19. What is another example of a wheel and axle?
In pounds.
Door knob.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.

20. Friction is involved when?
In Horsepower.
A modification of an inclined plane.
Two surfaces move against one another.
To speed up the motion of resistence.

21. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.

22. What is one type of second class lever?
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.
Opposite.
Door knob.

23. How is distance measured in work?
Feet.
45
fulcrum- weight- effort
Work=Force*Distance

24. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
In pounds.
Less than 1.
45

25. Work is measured in units also known as?
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
Less than 1.
Foot- 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.

26. The bevel gear is used to connect what?
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.
In pounds.
Shafts lying at any given angle.

27. How can you figure out the mechanical advantage of most block and falls by glance?
A screw and a spur gear.
Simple machine
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.

28. What is the formula for the wheel and axle?
The change of the direction of the pull.
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
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

29. What is the purpose of a third class lever?
Can change the direction of motion.
To speed up the motion of resistence.
Less than 1.
your arm.

30. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance
Magnify or reduce the force which you apply.

31. 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.
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.
To magnify the applied force.

32. What direction does the effort and resistance move in third class levers.
Same.
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
Count the number of parts of the rope going to and from the movable block.

33. What is the ratio of any gear train?
A screw and a spur gear.
Length of ramp/length of height from floor to truck
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.

34. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

35. What kind of machine is the inclined plane?
Simple machine
With oil - grease or soap.
A few thousandths of an inch.
In Horsepower.

36. What is another way to find the mechanical advantage of an inclined plane?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
45
Length of ramp/length of height from floor to truck

37. A miter gear connects 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.
Connects shafts having a 90 degree angle.
The change of the direction of the pull.
2(pie)/pitch

38. What is the jack screw used for?
32/8 = 4
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.
Opposite.

39. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.
Work=Force*Distance
Connects shafts having a 90 degree angle.

40. Class two lever
Mechanical disadvantage. Use more force than the force of the load you lift.
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.
Third class lever.

41. What is the mechanical advantage for a single fixed block?
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
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

42. How is work done?
Two surfaces move against one another.
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.

43. What is the second thing a gear can do?
Door knob.
Simple machine
To magnify the applied force.
Increase or decrease the the speed of the applied motion.

44. What is the lever formula?
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45
Gravity - Magnetism - Friction - Recoil

45. An egg beater has a mechanical advantage of what?
Magnify or reduce the force which you apply.
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.

46. What is the work formula?
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
your arm.

47. What is the first thing a gear can do?
Can change the direction of motion.
32/8 = 4
To raise a house or other heavy machinery.
Same.

48. What is the theoretical mechanical advantage of any gear train?
2. Each half of the rope carries an equal amount of weight.
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.
To magnify the applied force.

49. What is an example of a third class lever?
In pounds.
Feet.
Increase or decrease the the speed of the applied motion.
your arm.

50. 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
Connects shafts having a 90 degree angle.
Same.
Third class lever.