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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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
Two surfaces move against one another.

2. What is the formula for the mechanical advantage of a screw?
Magnify or reduce the force which you apply.
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

3. What does a micrometer measure?
A few thousandths of an inch.
Third class lever.
To raise a house or other heavy machinery.
Same.

4. What is the first thing a gear can do?
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil

5. What is the second thing a gear can do?
1
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
32/8 = 4

6. What is the formula for the 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.
fulcrum- weight- effort
your arm.

7. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
To magnify the applied force.
In Horsepower.

8. With a single fixed sheave what is the only mechanical advantage?
In Horsepower.
Magnify or reduce the force which you apply.
The change of the direction of the pull.
To magnify the applied force.

9. hat is a screw?
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.
Simple machine
Feet.
A modification of an inclined plane.

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?
1
Feet.
32/8 = 4
To speed up the motion of resistence.

11. What kind of machine is the inclined plane?
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine

12. What is the mechanical advantage for a single fixed block?
Power=Work/Time
With oil - grease or soap.
1
Can change the direction of motion.

13. What is the third thing a gear can do?
Gravity - Magnetism - Friction - Recoil
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.
To magnify the applied force.

14. What is one type of second class lever?
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
Can change the direction of motion.

15. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
32/8 = 4

16. Gears can do a job for you by changing what three things?
Power=Work/Time
Door knob.
Same.
Direction - speed or size of the force applied.

17. What direction does the effort and resistance move in third class levers.
1
A modification of an inclined plane.
Can change the direction of motion.
Same.

18. What is the work formula?
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
Work=Force*Distance

19. How can you figure out the mechanical advantage of most block and falls by glance?
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.

20. What direction does the effort and resistance move in the second class levers?
Same.
To raise a house or other heavy machinery.
Opposite.
Foot- pounds

21. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
your arm.
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance

22. A miter gear connects what?
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.

23. What is an example of a third class lever?
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.

24. Friction is involved when?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
1
Two surfaces move against one another.

25. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.

26. How can you decrease friction on flat surfaces?
In pounds.
To magnify the applied force.
With oil - grease or soap.
Direction - speed or size of the force applied.

27. The miter gear faces are beveled at what angle?
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
Wheel and axle.
45

28. Formula for fractional mechanical disadvantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
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.
Same.

29. What kind of mechanical advantage does the first and second class lever provide?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.
A modification of an inclined plane.
Positive mechanical advantage.

30. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
To magnify the applied force.
fulcrum- weight- effort

31. The worm gear is a combination of what?
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
A screw and a spur gear.
Wheel and axle.

32. What type of lever provides a fractional mechanical advantage?
Opposite.
Less than 1.
Third class lever.
Same.

33. What is the power formula?
Increase or decrease the the speed of the applied motion.
Less than 1.
Power=Work/Time
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

34. 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.
Door knob.
Opposite.
2. Each half of the rope carries an equal amount of weight.

35. What is another example of a wheel and axle?
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.
Door knob.

36. Work is measured in units also known as?
In pounds.
Opposite.
Foot- pounds
Magnify or reduce the force which you apply.

37. What is the theoretical mechanical advantage of any gear train?
Foot- pounds
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
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

38. What is the ratio of any gear train?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.

39. How is distance measured in work?
Direction - speed or size of the force applied.
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.
To speed up the motion of resistence.

40. The bevel gear is used to connect what?
Can change the direction of motion.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.
Shafts lying at any given angle.

41. What is the lever formula?
2(pie)/pitch
Feet.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

42. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
45
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.

43. What direction does the effort and resistance move in first class levers?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
Opposite.
45

44. 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.
Magnify or reduce the force which you apply.
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
Gravity - Magnetism - Friction - Recoil

45. An egg beater has a mechanical advantage of what?
Foot- pounds
Same.
Door knob.
Less than 1.

46. Class two lever
fulcrum- weight- effort
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.
Gravity - Magnetism - Friction - Recoil

47. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Foot- pounds
fulcrum- weight- effort
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

48. How do you measure power?
In Horsepower.
Equals the weight of the object being hoisted.
Power=Work/Time
Work=Force*Distance

49. What are first and third class levers used for?
To magnify the applied force.
Positive mechanical advantage.
Direction - speed or size of the force applied.
Same.

50. What is the jack screw used for?
Simple machine
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
To raise a house or other heavy machinery.
fulcrum- weight- effort