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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 another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Feet.
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

2. The worm gear is a combination of what?
To speed up the motion of resistence.
Same.
With oil - grease or soap.
A screw and a spur gear.

3. What is the third thing a gear can do?
Power=Work/Time
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.
Can change the direction of motion.

4. Friction is involved when?
To raise a house or other heavy machinery.
fulcrum- weight- effort
Two surfaces move against one another.
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 are the 4 forces?
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
1
Gravity - Magnetism - Friction - Recoil

6. What is the mechanical advantage for a single fixed block?
In Horsepower.
Direction - speed or size of the force applied.
2(pie)/pitch
1

7. What is an example of a third class lever?
Same.
Foot- pounds
Can change the direction of motion.
your arm.

8. What is another example of a wheel and axle?
Work=Force*Distance
Door knob.
A few thousandths of an inch.
To raise a house or other heavy machinery.

9. How is work done?
Power=Work/Time
Simple machine
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.

10. 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.
Power=Work/Time
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.

11. How is force measured in work?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.
In pounds.

12. What is one type of second class lever?
To speed up the motion of resistence.
Two surfaces move against one another.
2(pie)/pitch
Wheel and axle.

13. 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.
your arm.
Foot- pounds
Positive mechanical advantage.

14. What are first and third class levers used for?
Third class lever.
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil

15. What is the work formula?
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
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.

16. Fractional mechanical advantage
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
Simple machine
Third class lever.

17. What is the second thing a gear can do?
Foot- pounds
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.
Door knob.

18. 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?
With oil - grease or soap.
Simple machine
32/8 = 4
Wheel and axle.

19. 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.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.

20. What is the power formula?
Power=Work/Time
Direction - speed or size of the force applied.
fulcrum- weight- effort
Connects shafts having a 90 degree angle.

21. What kind of mechanical advantage does the first and second class lever provide?
Direction - speed or size of the force applied.
Power=Work/Time
Same.
Positive mechanical advantage.

22. How can you decrease friction on flat surfaces?
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
With oil - grease or soap.
Wheel and axle.

23. hat is a screw?
fulcrum- weight- effort
A modification of an inclined plane.
In Horsepower.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

24. How is distance measured in work?
Direction - speed or size of the force applied.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.

25. How do you find the mechanical advantage?
Equals the weight of the object being hoisted.
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.
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

26. What kind of machine is the inclined plane?
32/8 = 4
Simple machine
Two surfaces move against one another.
Door knob.

27. What is the purpose of a third class lever?
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Same.
To speed up the motion of resistence.

28. What type of lever provides a fractional mechanical advantage?
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.
1
Third class lever.

29. An egg beater has a mechanical advantage of what?
Less than 1.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.
Same.

30. How can you figure out the mechanical advantage of most block and falls by glance?
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.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.

31. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
2(pie)/pitch

32. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.
Same.

33. How do you measure power?
Direction - speed or size of the force applied.
Opposite.
In Horsepower.
To raise a house or other heavy machinery.

34. The threads of a screw are cut so?
Can change the direction of motion.
Third class lever.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

35. A miter gear connects what?
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by 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.

36. What is the ratio of any gear train?
A modification of an inclined plane.
32/8 = 4
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.

37. Work is measured in units also known as?
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
your arm.

38. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
32/8 = 4

39. Gears can do a job for you by changing what three things?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Direction - speed or size of the force applied.
Wheel and axle.
Same.

40. What is the jack screw used for?
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.
A modification of an inclined plane.
To raise a house or other heavy machinery.

41. What direction does the effort and resistance move in third class levers.
Same.
Third class lever.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.

42. The miter gear faces are beveled at what angle?
Power=Work/Time
Work=Force*Distance
45
2. Each half of the rope carries an equal amount of weight.

43. What direction does the effort and resistance move in first class levers?
Opposite.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Feet.

44. Class two lever
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.
your arm.
fulcrum- weight- effort

45. Formula for fractional mechanical disadvantage.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
Foot- pounds

46. With a single fixed sheave what is the only mechanical advantage?
Two surfaces move against one another.
2(pie)/pitch
With oil - grease or soap.
The change of the direction of the pull.

47. 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
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.

48. The bevel gear is used to connect what?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
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
fulcrum- weight- effort

49. What is the first thing a gear can do?
Can change the direction of motion.
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort

50. What is the mechanical advantage of a single movable block?
A few thousandths of an inch.
Simple machine
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.