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Quiz 1: Simple Mechanics about Types of Levers

Quiz by Mr.MD Showket Hasan

Grade 8
Science
Thailand Core Curriculum

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20 questions
Show answers
  • Q1
    1. A first class lever has a load arm of 0.4 m and an effort arm of 1.2 m. What is its mechanical advantage?
    1.6
    3
    0.3
    4.8
    30s
    SC8.FM.1
  • Q2
    2. A wheelbarrow (second class lever) lifts a load of 900 N. If the effort arm is 1.8 m and the load arm is 0.6 m, how much effort is needed?
    150 N
    600 N
    300 N
    450 N
    30s
  • Q3
    3. Which lever class always has a mechanical advantage <1?
    None
    Third class
    Second class
    First class
    30s
  • Q4
    4. A broom is an example of a third class lever. If the effort arm is 0.2 m and the load arm is 0.8 m, what is its MA?
    0.4
    0.25
    4
    2.5
    30s
  • Q5
    5. A seesaw (first class lever) balances when Child A (200 N) sits 1.5 m from the fulcrum. How far should Child B (300 N) sit?
    1.5 m
    2.0 m
    2.5 m
    1.0 m
    30s
  • Q6
    6. A second class lever requires 150 N of effort to lift a 450 N load. What is its MA?
    4.5
    6
    1.5
    3
    30s
  • Q7
    7. Which tool uses a third class lever?
    Tweezers
    Crowbar
    Scissors
    Wheelbarrow
    30s
  • Q8
    8. A lever system has MA = 0.5. Which class is it?
    Third class
    Cannot determine
    Second class
    First class
    30s
  • Q9
    9. A nutcracker (second class lever) has a load arm of 0.1 m. If the MA is 4, how long is the effort arm?
    0.25 m
    0.25 m
    0.4 m
    1.6 m
    30s
  • Q10
    10. A shovel is a third class lever. If the effort arm is 0.3 m and the load arm is 0.9 m, how much effort is needed to lift a 60 N load?
    60 N
    180 N
    90 N
    20 N
    30s
  • Q11
    11. Which lever class can have MA >1, =1, or <1?
    First class
    Third class
    All classes
    Second class
    30s
  • Q12
    12. A crowbar (first class lever) has an effort arm of 2 m and a load arm of 0.5 m. What is its MA?
    0.25
    8
    1
    4
    30s
  • Q13
    13. A lever system lifts 800 N with 200 N of effort. What is its MA?
    4
    16
    8
    0.25
    30s
  • Q14
    14. Which statement is true for second class levers?
    Example: stapler
    MA is always >1
    Effort is between fulcrum and load
    They amplify speed
    30s
  • Q15
    15. A third class lever has an effort arm of 0.5 m and a load arm of 1.5 m. What is its MA?
    1.5
    3
    0.33
    0.5
    30s

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