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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. The bevel gear is used to connect what?
Power=Work/Time
A few thousandths of an inch.
Same.
Shafts lying at any given angle.

2. How can you decrease friction on flat surfaces?
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
45
Gravity - Magnetism - Friction - Recoil

3. What is another way to find the mechanical advantage of an inclined plane?
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.
In Horsepower.
Length of ramp/length of height from floor to truck

4. What is one type of second class lever?
Wheel and axle.
In Horsepower.
Shafts lying at any given angle.
A screw and a spur gear.

5. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
A modification of an inclined plane.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

6. What direction does the effort and resistance move in the second class levers?
Door knob.
Same.
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.

7. How is distance measured in work?
A modification of an inclined plane.
Opposite.
Feet.
Power=Work/Time

8. How can you figure out the mechanical advantage of most block and falls by glance?
Mechanical disadvantage. Use more force than the force of the load you lift.
Count the number of parts of the rope going to and from the movable block.
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

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

10. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Opposite.
Third class lever.
Gravity - Magnetism - Friction - Recoil

11. What kind of machine is the inclined plane?
Simple machine
Magnify or reduce the force which you apply.
Wheel and axle.
45

12. An egg beater has a mechanical advantage of what?
Less than 1.
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
Foot- pounds

13. What is the work formula?
In pounds.
Equals the weight of the object being hoisted.
Work=Force*Distance
Connects shafts having a 90 degree angle.

14. What is an example of a third class lever?
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
your arm.
To magnify the applied force.

15. Formula for fractional mechanical disadvantage.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The change of the direction of the pull.
Same.

16. What are first and third class levers used for?
Wheel and axle.
Positive mechanical advantage.
Can change the direction of motion.
To magnify the applied force.

17. What are the 4 forces?
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
Feet.

18. What is another example of a wheel and axle?
Connects shafts having a 90 degree angle.
Door knob.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.

19. Gears can do a job for you by changing what three things?
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.
your arm.

20. What is the formula for the mechanical advantage of a screw?
A modification of an inclined plane.
2(pie)/pitch
To speed up the motion of resistence.
In pounds.

21. A miter gear connects what?
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time
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.

22. Work is measured in units also known as?
Foot- pounds
Two surfaces move against one another.
Feet.
The force used to overcome friction is greater than the force used to do useful work.

23. 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?
Less than 1.
32/8 = 4
Equals the weight of the object being hoisted.
Two surfaces move against one another.

24. 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.
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.

25. What is the mechanical advantage of a single movable block?
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.

26. What direction does the effort and resistance move in first class levers?
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
A few thousandths of an inch.

27. What is the formula for the wheel and axle?
Work=Force*Distance
32/8 = 4
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
Equals the weight of the object being hoisted.

28. How do you measure power?
In pounds.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
Shafts lying at any given angle.

29. What is the lever formula?
A screw and a spur gear.
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
fulcrum- weight- effort

30. 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.
Wheel and axle.
Can change the direction of motion.
Work=Force*Distance

31. What is the first thing a gear can do?
In Horsepower.
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort

32. How is work done?
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
your arm.

33. Friction is involved when?
Two surfaces move against one another.
Less than 1.
In pounds.
Length of ramp/length of height from floor to truck

34. How is force measured in work?
Simple machine
In pounds.
Shafts lying at any given angle.
The rope that passes through your hands is greater than the distance that the load is raised.

35. What is the mechanical advantage for a single fixed block?
1
Shafts lying at any given angle.
In Horsepower.
A screw and a spur gear.

36. What is the power formula?
Power=Work/Time
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.

37. What is the purpose of a third class lever?
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
Wheel and axle.

38. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
Simple machine

39. How do you find the mechanical advantage?
Direction - speed or size of the force applied.
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.
The change of the direction of the pull.

40. What is the jack screw used for?
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.
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.

41. Class two lever
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
To raise a house or other heavy machinery.
A screw and a spur gear.

42. What is the second thing a gear can do?
Same.
Increase or decrease the the speed of the applied motion.
In Horsepower.
Same.

43. What does a micrometer measure?
Power=Work/Time
To magnify the applied force.
A few thousandths of an inch.
Less than 1.

44. The worm gear is a combination of what?
In pounds.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Can change the direction of motion.

45. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
1
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.

46. The miter gear faces are beveled at what angle?
Positive mechanical advantage.
To magnify the applied force.
Equals the weight of the object being hoisted.
45

47. What direction does the effort and resistance move in third class levers.
Same.
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
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.

48. hat is a screw?
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
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
In Horsepower.

49. What is the third thing a gear can do?
Equals the weight of the object being hoisted.
1
Magnify or reduce the force which you apply.
32/8 = 4

50. What type of lever provides a fractional mechanical advantage?
Simple machine
45
Third class lever.
Magnify or reduce the force which you apply.