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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 force measured in work?
Equals the weight of the object being hoisted.
In pounds.
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.

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

3. 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.
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.
Direction - speed or size of the force applied.

4. What is an example of a third class lever?
your arm.
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.

5. The worm gear is a combination of what?
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
Simple machine
A screw and a spur gear.

6. What type of lever provides a fractional mechanical advantage?
Third class lever.
The change of the direction of the pull.
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.

7. What is the ratio of any gear train?
To magnify the applied force.
Wheel and axle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

8. What is the second thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.

9. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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 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.
In pounds.

10. Formula for fractional mechanical disadvantage.
Magnify or reduce the force which you apply.
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.
Door knob.

11. An egg beater has a mechanical advantage of what?
In Horsepower.
Less than 1.
A modification of an inclined plane.
your arm.

12. How do you measure power?
fulcrum- weight- effort
A few thousandths of an inch.
In Horsepower.
Wheel and axle.

13. What is the jack screw used for?
A modification of an inclined plane.
To raise a house or other heavy machinery.
With oil - grease or soap.
Work=Force*Distance

14. How is work done?
Connects shafts having a 90 degree angle.
With oil - grease or soap.
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.

15. The bevel gear is used to connect what?
Direction - speed or size of the force applied.
1
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.

16. What are the 4 forces?
Positive mechanical advantage.
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
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch

17. What direction does the effort and resistance move in third class levers.
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.
Opposite.
Equals the weight of the object being hoisted.

18. What kind of mechanical advantage does the first and second class lever provide?
Increase or decrease the the speed of the applied motion.
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
Length of ramp/length of height from floor to truck
Positive mechanical advantage.

19. How is distance measured in work?
To speed up the motion of resistence.
Feet.
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil

20. What is the purpose of a third class lever?
Power=Work/Time
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.
To speed up the motion of resistence.

21. Class two lever
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.
fulcrum- weight- effort
Foot- pounds

22. What direction does the effort and resistance move in the second class levers?
In pounds.
Same.
To raise a house or other heavy machinery.
Less than 1.

23. What is the first thing a gear can do?
Can change the direction of motion.
your arm.
Length of ramp/length of height from floor to truck
Same.

24. Fractional mechanical advantage
2(pie)/pitch
A few thousandths of an inch.
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.

25. What is one type of second class lever?
Increase or decrease the the speed of the applied motion.
Opposite.
Wheel and axle.
In Horsepower.

26. How do you find the mechanical advantage?
Power=Work/Time
To magnify the applied force.
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.
Direction - speed or size of the force applied.

27. What does a micrometer measure?
Gravity - Magnetism - Friction - Recoil
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
A few thousandths of an inch.
2(pie)/pitch

28. What is the lever formula?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

29. What is another example of a wheel and axle?
1
Door knob.
The change of the direction of the pull.
Feet.

30. What kind of machine is the inclined plane?
Simple machine
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

31. What direction does the effort and resistance move in first class levers?
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.
45
Opposite.

32. What are first and third class levers used for?
A modification of an inclined plane.
Less than 1.
The change of the direction of the pull.
To magnify the applied force.

33. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.
Same.

34. 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?
Count the number of parts of the rope going to and from the movable block.
32/8 = 4
Two surfaces move against one another.
To speed up the motion of resistence.

35. What is the third thing a gear can do?
In Horsepower.
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
Positive mechanical advantage.

36. The miter gear faces are beveled at what angle?
Third class lever.
45
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.

37. What is the work formula?
Work=Force*Distance
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
A modification of an inclined plane.

38. 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
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
Door knob.

39. A miter gear connects what?
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.

40. Gears can do a job for you by changing what three things?
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
Direction - speed or size of the force applied.

41. What is another way to find the mechanical advantage of an inclined plane?
Feet.
Wheel and axle.
Length of ramp/length of height from floor to truck
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

42. Work is measured in units also known as?
To raise a house or other heavy machinery.
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.
Foot- pounds

43. What is the theoretical mechanical advantage of any gear train?
Connects shafts having a 90 degree angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Third 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.

44. hat is a screw?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The change of the direction of the pull.
A modification of an inclined plane.
Positive mechanical advantage.

45. What is the power formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45
Door knob.
Power=Work/Time

46. What is the mechanical advantage for a single fixed block?
2(pie)/pitch
Feet.
Wheel and axle.
1

47. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.
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

48. With a single fixed sheave what is the only mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.
To magnify the applied force.

49. Friction is involved when?
The rope that passes through your hands is greater than the distance that the load is raised.
1
Two surfaces move against one another.
To raise a house or other heavy machinery.

50. How can you decrease friction on flat surfaces?
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 speed up the motion of resistence.
Opposite.
With oil - grease or soap.