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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?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil

2. What direction does the effort and resistance move in first class levers?
Shafts lying at any given angle.
Opposite.
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.
Wheel and axle.

3. What type of lever provides a fractional mechanical advantage?
Power=Work/Time
Increase or decrease the the speed of the applied motion.
Simple machine
Third class lever.

4. An egg beater has a mechanical advantage of what?
2. Each half of the rope carries an equal amount of weight.
Less than 1.
The force used to overcome friction is greater than the force used to do useful 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.

5. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.
1

6. How can you figure out the mechanical advantage of most block and falls by glance?
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.
Simple machine
Magnify or reduce the force which you apply.

7. Fractional mechanical advantage
A few thousandths of an inch.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.

8. What is the work formula?
Power=Work/Time
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch

9. What is the purpose of a third class lever?
To speed up the motion of resistence.
Door knob.
Same.
When a resistance is overcome by a force acting through a measurable distance.

10. What is the theoretical mechanical advantage of any gear train?
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.

11. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Foot- pounds

12. What is the power formula?
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
Work=Force*Distance
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.
Gravity - Magnetism - Friction - Recoil
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.
With oil - grease or soap.

14. What kind of machine is the inclined plane?
Gravity - Magnetism - Friction - Recoil
1
Power=Work/Time
Simple machine

15. What direction does the effort and resistance move in the second class levers?
With oil - grease or soap.
Same.
Increase or decrease the the speed of the applied motion.
your arm.

16. The worm gear is a combination of what?
Direction - speed or size of the force applied.
With oil - grease or soap.
Simple machine
A screw and a spur gear.

17. What is the formula for the mechanical advantage of a screw?
1
2(pie)/pitch
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil

18. A miter gear connects what?
1
Can change the direction of motion.
Connects shafts having a 90 degree angle.
Same.

19. How can you decrease friction on flat surfaces?
Positive mechanical advantage.
With oil - grease or soap.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.

20. The bevel gear is used to connect what?
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds

21. Formula for fractional mechanical disadvantage.
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

22. The miter gear faces are beveled at what angle?
45
The force used to overcome friction is greater than the force used to do useful work.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance

23. What is another way to find the mechanical advantage of an inclined plane?
Third class lever.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.
Power=Work/Time

24. What does a micrometer measure?
In pounds.
A few thousandths of an inch.
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

25. What are first and third class levers used for?
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 magnify the applied force.
In pounds.
1

26. What is an example of a third class lever?
your arm.
To raise a house or other heavy machinery.
In pounds.
Same.

27. What kind of mechanical advantage does the first and second class lever provide?
To magnify the applied force.
Positive mechanical advantage.
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.

28. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.

29. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Gravity - Magnetism - Friction - Recoil

30. How is distance measured in work?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
Foot- pounds
Opposite.

31. What is another example of a 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
Door knob.
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

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

33. What is the mechanical advantage for a single fixed block?
1
To magnify the applied force.
Length of ramp/length of height from floor to truck
Feet.

34. What is the formula for the wheel and axle?
In Horsepower.
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
Feet.

35. 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?
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.
Foot- pounds
32/8 = 4

36. hat is a screw?
A modification of an inclined plane.
Opposite.
Feet.
Increase or decrease the the speed of the applied motion.

37. With a single fixed sheave what is the only mechanical advantage?
Less than 1.
Positive mechanical advantage.
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.

38. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
To magnify the applied force.

39. What is the mechanical advantage of a single movable block?
Magnify or reduce the force which you apply.
Opposite.
Door knob.
2. Each half of the rope carries an equal amount of weight.

40. Work is measured in units also known as?
A modification of an inclined plane.
Power=Work/Time
Foot- pounds
In pounds.

41. What is the ratio of any gear train?
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

42. 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
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
Positive mechanical advantage.

43. What is the jack screw used for?
The change of the direction of the pull.
To raise a house or other heavy machinery.
2(pie)/pitch
Opposite.

44. What is the first thing a gear can do?
Same.
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

45. How do you measure power?
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.
1
Simple machine

46. What direction does the effort and resistance move in third 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.
Same.
Power=Work/Time
32/8 = 4

47. Class two lever
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.
Simple machine
fulcrum- weight- effort

48. 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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.
A few thousandths of an inch.

49. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
32/8 = 4
In Horsepower.
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.

50. The threads of a screw are cut so?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.