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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 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. What is one type of second class lever?
45
Opposite.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil

2. Fractional mechanical advantage
Equals the weight of the object being hoisted.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

3. How can you decrease friction on flat surfaces?
To magnify the applied force.
Length of ramp/length of height from floor to truck
With oil - grease or soap.
2(pie)/pitch

4. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Shafts lying at any given angle.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

5. The miter gear faces are beveled at what angle?
To speed up the motion of resistence.
fulcrum- weight- effort
45
your arm.

6. 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?
Connects shafts having a 90 degree angle.
32/8 = 4
With oil - grease or soap.
fulcrum- weight- effort

7. What does a micrometer measure?
A few thousandths of an inch.
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.
2. Each half of the rope carries an equal amount of weight.

8. 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.
Foot- pounds
In Horsepower.
To magnify the applied force.

9. What is the formula for the mechanical advantage of a screw?
32/8 = 4
The force used to overcome friction is greater than the force used to do useful work.
Same.
2(pie)/pitch

10. What direction does the effort and resistance move in the second class levers?
Equals the weight of the object being hoisted.
To magnify the applied force.
Simple machine
Same.

11. What direction does the effort and resistance move in first class levers?
Opposite.
Same.
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.

12. What is the purpose of a third class lever?
Same.
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To speed up the motion of resistence.

13. Formula for fractional mechanical disadvantage.
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
32/8 = 4
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

14. An egg beater has a mechanical advantage of what?
Count the number of parts of the rope going to and from the movable block.
Less than 1.
your arm.
Wheel and axle.

15. What is the first thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.
Can change the direction of motion.

16. 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.
In pounds.
2. Each half of the rope carries an equal amount of weight.
Feet.

17. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
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.
Feet.
Power=Work/Time

18. What direction does the effort and resistance move in third class levers.
Same.
A screw and a spur gear.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.

19. With a single fixed sheave what is the only mechanical advantage?
1
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
The change of the direction of the pull.

20. What type of lever provides a fractional mechanical advantage?
With oil - grease or soap.
Third class lever.
Simple machine
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.

21. A miter gear connects what?
Opposite.
Connects shafts having a 90 degree angle.
Simple machine
Work=Force*Distance

22. Class two lever
45
fulcrum- weight- effort
Same.
2(pie)/pitch

23. How is distance measured in work?
To magnify the applied force.
Feet.
Direction - speed or size of the force applied.
A modification of an inclined plane.

24. How is work done?
32/8 = 4
Magnify or reduce the force which you apply.
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.

25. What is an example of a third class lever?
Same.
With oil - grease or soap.
your arm.
In pounds.

26. What is another example of a wheel and axle?
Door knob.
Opposite.
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.

27. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Shafts lying at any given angle.
Opposite.
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

28. hat is a screw?
Same.
The change of the direction of the pull.
A modification of an inclined plane.
With oil - grease or soap.

29. What is the mechanical advantage of a single movable block?
Wheel and axle.
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
your arm.

30. What is the formula for the 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.
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 force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.

31. What are first and third class levers used for?
45
Third class lever.
Wheel and axle.
To magnify the applied force.

32. The worm gear is a combination of what?
Gravity - Magnetism - Friction - Recoil
Simple machine
A screw and a spur gear.
With oil - grease or soap.

33. Work is measured in units also known as?
Two surfaces move against one another.
Foot- pounds
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.

34. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Same.
Foot- pounds
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.

35. What kind of mechanical advantage does the first and second class lever provide?
The change of the direction of the pull.
Positive mechanical advantage.
Simple machine
Same.

36. What is the jack screw used for?
Work=Force*Distance
To raise a house or other heavy machinery.
Third class lever.
To magnify the applied force.

37. How do you find the mechanical advantage?
Equals the weight of the object being hoisted.
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.
Door knob.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

38. How do you measure power?
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
The change of the direction of the pull.

39. How is force measured in work?
1
fulcrum- weight- effort
Magnify or reduce the force which you apply.
In pounds.

40. What is the power formula?
Foot- pounds
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.
Power=Work/Time

41. What is the work formula?
Work=Force*Distance
In Horsepower.
To raise a house or other heavy machinery.
To magnify the applied force.

42. What is the second thing a gear can do?
Equals the weight of the object being hoisted.
Door knob.
Third class lever.
Increase or decrease the the speed of the applied motion.

43. The bevel gear is used to connect what?
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
your arm.
Same.

44. The threads of a screw are cut so?
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
fulcrum- weight- effort

45. What is the lever formula?
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
In pounds.

46. What kind of machine is the inclined plane?
2(pie)/pitch
32/8 = 4
Simple machine
Two surfaces move against one another.

47. How can you figure out the mechanical advantage of most block and falls by glance?
Feet.
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.
The change of the direction of the pull.

48. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
1
A screw and a spur gear.

49. Friction is involved when?
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
Connects shafts having a 90 degree angle.
Wheel and axle.

50. What is the mechanical advantage for a single fixed block?
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.
1
In pounds.