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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. 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?
Length of ramp/length of height from floor to truck
Less than 1.
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

2. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.

3. What direction does the effort and resistance move in the second class levers?
1
To raise a house or other heavy machinery.
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.

4. What is the mechanical advantage for a single fixed block?
1
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.

5. The worm gear is a combination of what?
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.
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.

6. What direction does the effort and resistance move in third class levers.
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.
Feet.
Same.

7. What direction does the effort and resistance move in first class levers?
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
Direction - speed or size of the force applied.
Door knob.

8. How is distance measured in work?
2(pie)/pitch
Feet.
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.

9. Class two lever
fulcrum- weight- effort
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.

10. What is the power formula?
your arm.
Power=Work/Time
Same.
The change of the direction of the pull.

11. hat is a screw?
Simple machine
Increase or decrease the the speed of the applied motion.
Third class lever.
A modification of an inclined plane.

12. What does a micrometer measure?
A modification of an inclined plane.
32/8 = 4
Two surfaces move against one another.
A few thousandths of an inch.

13. How can you figure out the mechanical advantage of most block and falls by glance?
In pounds.
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
In Horsepower.

14. The miter gear faces are beveled at what angle?
Positive mechanical advantage.
45
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

15. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.

16. The bevel gear is used to connect what?
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
Two surfaces move against one another.

17. Work is measured in units also known as?
Equals the weight of the object being hoisted.
fulcrum- weight- effort
Foot- pounds
With oil - grease or soap.

18. What is another example of a wheel and axle?
Feet.
Door knob.
Connects shafts having a 90 degree angle.
Same.

19. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
Equals the weight of the object being hoisted.

20. How can you decrease friction on flat surfaces?
Power=Work/Time
With oil - grease or soap.
In Horsepower.
A modification of an inclined plane.

21. What is the formula for the mechanical advantage of a screw?
Power=Work/Time
A modification of an inclined plane.
A screw and a spur gear.
2(pie)/pitch

22. What is the theoretical mechanical advantage of any gear train?
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
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.

23. What is one type of second class lever?
With oil - grease or soap.
Wheel and axle.
Less than 1.
Simple machine

24. How do you find the mechanical advantage?
1
In pounds.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

25. How is force measured in work?
In pounds.
A modification of an inclined plane.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

26. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

27. What is the work formula?
Work=Force*Distance
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

28. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
Less than 1.
Simple machine

29. Fractional mechanical advantage
Same.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

30. What is the lever formula?
Same.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

31. Gears can do a job for you by changing what three things?
In pounds.
Direction - speed or size of the force applied.
The rope that passes through your hands is greater than the distance that the load is raised.
1

32. An egg beater has a mechanical advantage of what?
To raise a house or other heavy machinery.
Less than 1.
your arm.
32/8 = 4

33. Friction is involved when?
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.
Two surfaces move against one another.
Direction - speed or size of the force applied.

34. What kind of machine is the inclined plane?
Simple machine
Opposite.
Work=Force*Distance
With oil - grease or soap.

35. What is the third thing a gear can do?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
Magnify or reduce the force which you apply.
Third class lever.

36. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
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.
Direction - speed or size of the force applied.

37. How is work done?
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck

38. What is an example of a third class lever?
your arm.
Less than 1.
Same.
Third class lever.

39. What is the purpose of a third class lever?
Foot- pounds
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.

40. What is the first thing a gear can do?
Magnify or reduce the force which you apply.
Can change the direction of motion.
Door knob.
Mechanical disadvantage. Use more force than the force of the load you lift.

41. What is the formula for the wheel and axle?
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
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort

42. What kind of mechanical advantage does the first and second class lever provide?
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
Less than 1.
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.

43. What is the jack screw used for?
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
To magnify the applied force.
To raise a house or other heavy machinery.

44. What type of lever provides a fractional mechanical advantage?
To raise a house or other heavy machinery.
To magnify the applied force.
Third class lever.
Opposite.

45. What is another way to find the mechanical advantage of an inclined plane?
Equals the weight of the object being hoisted.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Length of ramp/length of height from floor to truck
Wheel and axle.

46. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
fulcrum- weight- effort
Positive mechanical advantage.
A modification of an inclined plane.

47. How do you measure power?
To speed up the motion of resistence.
In Horsepower.
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.

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

49. What is the ratio of any gear train?
32/8 = 4
In Horsepower.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance

50. A miter gear connects what?
A few thousandths of an inch.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.