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Mechanical Systems 3

Instructions:

Answer 50 questions in 30 minutes.
If you are not ready to take this test, you can study here.
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. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.

2. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

3. What kind of machine is the inclined plane?
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Equals the weight of the object being hoisted.
Simple machine

4. What is the second thing a gear can do?
Wheel and axle.
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.

5. What is the third thing a gear can do?
45
fulcrum- weight- effort
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.

6. Friction is involved when?
32/8 = 4
Two surfaces move against one another.
1
Count the number of parts of the rope going to and from the movable block.

7. What direction does the effort and resistance move in first class levers?
Opposite.
To magnify the applied force.
your arm.
Door knob.

8. What is the mechanical advantage of a single movable block?
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
To speed up the motion of resistence.

9. What is one type of second class lever?
Length of ramp/length of height from floor to truck
With oil - grease or soap.
Less than 1.
Wheel and axle.

10. 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?
Simple machine
32/8 = 4
Third class lever.
Magnify or reduce the force which you apply.

11. Work is measured in units also known as?
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.
Wheel and axle.
Foot- pounds

12. Class two lever
fulcrum- weight- effort
In Horsepower.
To speed up the motion of resistence.
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

13. What is the jack screw used for?
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.
Same.
Power=Work/Time

14. How can you figure out the mechanical advantage of most block and falls by glance?
Same.
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.

15. hat is a screw?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Shafts lying at any given angle.

16. What direction does the effort and resistance move in third class levers.
In pounds.
Foot- pounds
Same.
Third class lever.

17. What direction does the effort and resistance move in the second class levers?
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
Can change the direction of motion.
Same.
Work=Force*Distance

18. What is the power formula?
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
45
Opposite.

19. What is the mechanical advantage for a single fixed block?
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.
The force used to overcome friction is greater than the force used to do useful work.
1

20. How can you decrease friction on flat surfaces?
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
Feet.

21. The bevel gear is used to connect what?
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
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.

22. The miter gear faces are beveled at what angle?
Simple machine
Work=Force*Distance
Same.
45

23. What is the purpose of a third class lever?
Equals the weight of the object being hoisted.
Wheel and axle.
To speed up the motion of resistence.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

24. What is the formula for the wheel and axle?
In pounds.
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Simple machine

25. Gears can do a job for you by changing what three things?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.
45

26. The threads of a screw are cut so?
45
Work=Force*Distance
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.

27. How is distance measured in work?
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
32/8 = 4

28. Fractional mechanical advantage
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.

29. What is an example of a third class lever?
Power=Work/Time
Direction - speed or size of the force applied.
Same.
your arm.

30. How do you measure power?
In Horsepower.
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

31. What are the 4 forces?
Same.
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.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

32. What is another example of a wheel and axle?
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
32/8 = 4
Door knob.

33. What is the work formula?
A modification of an inclined plane.
Power=Work/Time
32/8 = 4
Work=Force*Distance

34. What kind of mechanical advantage does the first and second class lever provide?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Positive mechanical advantage.
With oil - grease or soap.
Same.

35. 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.
Can change the direction of motion.
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.

36. What is the ratio of any gear train?
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Magnify or reduce the force which you apply.
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. What does a micrometer measure?
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
Shafts lying at any given angle.

38. What is another way to find the mechanical advantage of an inclined plane?
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.
Third class lever.
Length of ramp/length of height from floor to truck

39. What is the theoretical mechanical advantage of any gear train?
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.

40. A miter gear connects what?
Connects shafts having a 90 degree angle.
Door knob.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

41. Formula for fractional mechanical disadvantage.
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.
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time

42. What type of lever provides a fractional mechanical advantage?
Feet.
Can change the direction of motion.
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.

43. How is force measured in work?
Feet.
In pounds.
Same.
Magnify or reduce the force which you apply.

44. How is work done?
In pounds.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time

45. What is the first thing a gear can do?
A modification of an inclined plane.
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.
Can change the direction of motion.

46. An egg beater has a mechanical advantage of what?
Shafts lying at any given angle.
Can change the direction of motion.
Less than 1.
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

47. What are first and third class levers used for?
Foot- pounds
Same.
1
To magnify the applied force.

48. How do you find the mechanical advantage?
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.
Two surfaces move against one another.
1
Direction - speed or size of the force applied.

49. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Feet.
Equals the weight of the object being hoisted.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.

50. The worm gear is a combination of what?
A screw and a spur gear.
1
Gravity - Magnetism - Friction - Recoil
Power=Work/Time