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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.
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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 another way to find the mechanical advantage of an inclined plane?
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
45
Length of ramp/length of height from floor to truck

2. Gears can do a job for you by changing what three things?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort
Direction - speed or size of the force applied.
1

3. What type of lever provides a fractional mechanical advantage?
Wheel and axle.
Third class lever.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

4. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
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.
Count the number of parts of the rope going to and from the movable block.

5. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
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.

6. What is the first thing a gear can do?
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.
fulcrum- weight- effort
To magnify the applied force.

7. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.

8. What is the power formula?
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 magnify the applied force.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time

9. How do you measure power?
In Horsepower.
Equals the weight of the object being hoisted.
In pounds.
A modification of an inclined plane.

10. Class two lever
Positive mechanical advantage.
fulcrum- weight- effort
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.
Can change the direction of motion.

11. How is work done?
Two surfaces move against one another.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.

12. 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?
Can change the direction of motion.
A few thousandths of an inch.
2(pie)/pitch
32/8 = 4

13. What is the work formula?
45
Connects shafts having a 90 degree angle.
Wheel and axle.
Work=Force*Distance

14. 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.
A screw and a spur gear.
Third class lever.
Length of ramp/length of height from floor to truck

15. What is another example of a wheel and axle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.
your arm.
Magnify or reduce the force which you apply.

16. How is distance measured in work?
Feet.
To raise a house or other heavy machinery.
Opposite.
2. Each half of the rope carries an equal amount of weight.

17. 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.
Opposite.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

18. 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.
To speed up the motion of resistence.
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.

19. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
Foot- pounds

20. What direction does the effort and resistance move in the second class levers?
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
1
Same.

21. What does a micrometer measure?
A modification of an inclined plane.
A few thousandths of an inch.
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.

22. Friction is involved when?
Work=Force*Distance
Two surfaces move against one another.
Door knob.
Simple machine

23. With a single fixed sheave what is the only mechanical advantage?
Same.
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time

24. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.

25. How is force measured in work?
2. Each half of the rope carries an equal amount of weight.
Door knob.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

26. What is the mechanical advantage of a single movable block?
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
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.

27. What is an example of a third class lever?
To speed up the motion of resistence.
your arm.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.

28. What is the lever formula?
Direction - speed or size of the force applied.
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.
When a resistance is overcome by a force acting through a measurable distance.

29. What is the mechanical advantage for a single fixed block?
Feet.
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
1

30. hat is a screw?
Less than 1.
Opposite.
A modification of an inclined plane.
Magnify or reduce the force which you apply.

31. An egg beater has a mechanical advantage of what?
A modification of an inclined plane.
Less than 1.
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

32. What is the purpose of a third class lever?
To speed up the motion of resistence.
your arm.
In Horsepower.
In pounds.

33. What is the theoretical mechanical advantage of any gear train?
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.
Can change the direction of motion.
Positive mechanical advantage.

34. What is the third thing a gear can do?
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.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.

35. What kind of machine is the inclined plane?
Door knob.
Gravity - Magnetism - Friction - Recoil
Simple machine
Foot- pounds

36. The bevel gear is used to connect what?
Shafts lying at any given angle.
Can change the direction of motion.
In pounds.
Simple machine

37. What kind of mechanical advantage does the first and second class lever provide?
Feet.
Positive mechanical advantage.
Power=Work/Time
In Horsepower.

38. What is the formula for the wheel and axle?
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
your arm.
Feet.

39. What is the ratio of any gear train?
With oil - grease or soap.
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

40. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

41. Work is measured in units also known as?
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.
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

42. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.

43. How can you figure out the mechanical advantage of most block and falls by glance?
Can change the direction of motion.
A few thousandths of an inch.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.

44. A miter gear connects what?
Count the number of parts of the rope going to and from the movable block.
In pounds.
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.

45. What direction does the effort and resistance move in third class levers.
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Foot- pounds
Same.

46. 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.
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
Connects shafts having a 90 degree angle.

47. What is the formula for the mechanical advantage of a screw?
fulcrum- weight- effort
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
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

48. What is one type of second class lever?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
1
To magnify the applied force.

49. What are first and third class levers used for?
Opposite.
Magnify or reduce the force which you apply.
fulcrum- weight- effort
To magnify the applied force.

50. The miter gear faces are beveled at what angle?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
45
Less than 1.