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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. Friction is involved when?
Two surfaces move against one another.
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.
In pounds.

2. What is the mechanical advantage of a single movable block?
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.

3. What type of lever provides a fractional mechanical advantage?
Work=Force*Distance
In Horsepower.
With oil - grease or soap.
Third class lever.

4. Class two lever
Same.
Length of ramp/length of height from floor to truck
fulcrum- weight- effort
Magnify or reduce the force which you apply.

5. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
32/8 = 4
In pounds.

6. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Work=Force*Distance
1
Connects shafts having a 90 degree angle.

7. What direction does the effort and resistance move in the second class levers?
Wheel and axle.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Same.

8. What direction does the effort and resistance move in first class levers?
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.

9. How do you find the mechanical advantage?
Opposite.
The force used to overcome friction is greater than the force used to do useful work.
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.

10. What is another example of a wheel and axle?
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance
Third class lever.
Door knob.

11. What is the lever formula?
32/8 = 4
Less than 1.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.

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?
When a resistance is overcome by a force acting through a measurable distance.
Same.
32/8 = 4
Shafts lying at any given angle.

13. The miter gear faces are beveled at what angle?
Power=Work/Time
Same.
Positive mechanical advantage.
45

14. What direction does the effort and resistance move in third class levers.
Same.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.

15. Work is measured in units also known as?
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
Foot- pounds
To magnify the applied force.
With oil - grease or soap.

16. What is the theoretical mechanical advantage of any gear train?
your arm.
The force used to overcome friction is greater than the force used to do useful work.
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.

17. With a single fixed sheave what is the only mechanical advantage?
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.
The change of the direction of the pull.
1

18. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.

19. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Wheel and axle.
A few thousandths of an inch.
Positive mechanical advantage.

20. How can you figure out the mechanical advantage of most block and falls by glance?
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.
To speed up the motion of resistence.

21. How do you measure power?
Can change the direction of motion.
In Horsepower.
your arm.
32/8 = 4

22. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

23. Formula for fractional mechanical disadvantage.
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.
Equals the weight of the object being hoisted.
Positive mechanical advantage.

24. What is an example of a third class lever?
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.
In pounds.
Two surfaces move against one another.

25. What is the work 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
The change of the direction of the pull.
Work=Force*Distance
Magnify or reduce the force which you apply.

26. hat is a screw?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
your arm.
Opposite.

27. What is the first thing a gear can do?
Can change the direction of motion.
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.
Feet.

28. How is work done?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.

29. What is the second thing a gear can do?
Connects shafts having a 90 degree angle.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.

30. What is the jack screw used for?
To raise a house or other heavy machinery.
Same.
Connects shafts having a 90 degree angle.
Third class lever.

31. What does a micrometer measure?
Length of ramp/length of height from floor to truck
Third class lever.
A few thousandths of an inch.
Shafts lying at any given angle.

32. How is distance measured in work?
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
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.
Feet.

33. How is force measured in work?
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.
To magnify the applied force.
In pounds.

34. What are first and third class levers used for?
To magnify the applied force.
Less than 1.
45
Gravity - Magnetism - Friction - Recoil

35. What kind of machine is the inclined plane?
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
2(pie)/pitch

36. What is the formula for the mechanical advantage of a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
Work=Force*Distance
Same.

37. What is the formula for the wheel and axle?
Third class lever.
fulcrum- weight- effort
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

38. The bevel gear is used to connect what?
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
Shafts lying at any given angle.

39. How can you decrease friction on flat surfaces?
A few thousandths of an inch.
With oil - grease or soap.
Wheel and axle.
Less than 1.

40. The worm gear is a combination of what?
With oil - grease or soap.
A screw and a spur gear.
fulcrum- weight- effort
The change of the direction of the pull.

41. What is the ratio of any gear train?
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Connects shafts having a 90 degree angle.

42. What is the purpose of a third class lever?
A few thousandths of an inch.
To speed up the motion of resistence.
Can change the direction of motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

43. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Same.
Can change the direction of motion.
To raise a house or other heavy machinery.

44. What is one type of second class lever?
Feet.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

45. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.

46. An egg beater has a mechanical advantage of what?
Simple machine
A modification of an inclined plane.
Positive mechanical advantage.
Less than 1.

47. A miter gear connects what?
Connects shafts having a 90 degree angle.
Work=Force*Distance
Third class lever.
In pounds.

48. What is the power formula?
Door knob.
Power=Work/Time
In pounds.
A few thousandths of an inch.

49. What is the mechanical advantage for a single fixed block?
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
1
Connects shafts having a 90 degree angle.
2(pie)/pitch

50. What are the 4 forces?
32/8 = 4
Opposite.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.