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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 work done?
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.

2. What is the mechanical advantage of a single movable 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.
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.

3. With a single fixed sheave what is the only mechanical advantage?
32/8 = 4
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
With oil - grease or soap.

4. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Door knob.
Count the number of parts of the rope going to and from the movable 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

5. How do you measure power?
Foot- pounds
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
Two surfaces move against one another.

6. The miter gear faces are beveled at what angle?
45
1
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

7. What are first and third class levers used for?
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
45

8. What is one type of second class lever?
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
Work=Force*Distance
Wheel and axle.
Can change the direction of motion.

9. The bevel gear is used to connect what?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Mechanical disadvantage. Use more force than the force of the load you lift.
32/8 = 4
Shafts lying at any given angle.

10. Class two lever
Door knob.
fulcrum- weight- effort
Third class lever.
A modification of an inclined plane.

11. How can you decrease friction on flat surfaces?
Magnify or reduce the force which you apply.
fulcrum- weight- effort
With oil - grease or soap.
To speed up the motion of resistence.

12. 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.
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
Gravity - Magnetism - Friction - Recoil

13. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
your arm.
To speed up the motion of resistence.

14. What is the power formula?
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.

15. What is an example of a third class lever?
In pounds.
your arm.
Same.
Door knob.

16. What is the theoretical mechanical advantage of any gear train?
Third class lever.
Work=Force*Distance
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.

17. What direction does the effort and resistance move in the second class levers?
your arm.
A modification of an inclined plane.
Foot- pounds
Same.

18. What direction does the effort and resistance move in first class levers?
1
Opposite.
Less than 1.
Same.

19. An egg beater has a mechanical advantage of what?
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Less than 1.

20. What kind of mechanical advantage does the first and second class lever provide?
fulcrum- weight- effort
Equals the weight of the object being hoisted.
32/8 = 4
Positive mechanical advantage.

21. Work is measured in units also known as?
Two surfaces move against one another.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds

22. What is the jack screw used for?
To raise a house or other heavy machinery.
Two surfaces move against one another.
In pounds.
Count the number of parts of the rope going to and from the movable block.

23. The threads of a screw are cut so?
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
The force used to overcome friction is greater than the force used to do useful work.
In pounds.

24. How do you find the mechanical advantage?
Increase or decrease the the speed of the applied motion.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

25. What is another way to find the mechanical advantage of an inclined plane?
Third class lever.
Count the number of parts of the rope going to and from the movable block.
Length of ramp/length of height from floor to truck
Same.

26. What is the work formula?
Wheel and axle.
Feet.
Length of ramp/length of height from floor to truck
Work=Force*Distance

27. How can you figure out the mechanical advantage of most block and falls by glance?
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.

28. What is the purpose of a third class lever?
Two surfaces move against one another.
To raise a house or other heavy machinery.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.

29. What is the lever formula?
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Mechanical disadvantage. Use more force than the force of the load you lift.

30. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
To magnify the applied force.
Positive mechanical advantage.

31. Fractional mechanical advantage
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
A screw and a spur gear.
Power=Work/Time

32. hat is a screw?
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
A modification of an inclined plane.
45

33. What type of lever provides a fractional mechanical advantage?
Equals the weight of the object being hoisted.
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.
Third class lever.

34. The worm gear is a combination of what?
A screw and a spur gear.
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.
Simple machine

35. What is the first thing a gear can do?
Can change the direction of motion.
Length of ramp/length of height from floor to truck
32/8 = 4
Third class lever.

36. 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
Equals the weight of the object being hoisted.
To magnify the applied force.
Door knob.

37. What is the mechanical advantage for a single fixed block?
Door knob.
Increase or decrease the the speed of the applied motion.
The force used to overcome friction is greater than the force used to do useful work.
1

38. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
In pounds.
Positive mechanical advantage.

39. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.
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.

40. What direction does the effort and resistance move in third class levers.
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
Same.
Direction - speed or size of the force applied.

41. What kind of machine is the inclined plane?
Connects shafts having a 90 degree angle.
Simple machine
A screw and a spur gear.
Less than 1.

42. Friction is involved when?
Power=Work/Time
Two surfaces move against one another.
Work=Force*Distance
Can change the direction of motion.

43. What does a micrometer measure?
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

44. How is distance measured in work?
In pounds.
Work=Force*Distance
Foot- pounds
Feet.

45. What is the formula for the wheel and axle?
When a resistance is overcome by a force acting through a measurable distance.
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.
Shafts lying at any given angle.
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

46. What is the third thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
Magnify or reduce the force which you apply.
Less than 1.

47. What is the ratio of any gear train?
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.
1
your arm.

48. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Power=Work/Time
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

49. A miter gear connects what?
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
Power=Work/Time
Foot- pounds

50. How is force measured in work?
To raise a house or other heavy machinery.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
Simple machine