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Unit 10 Review

Quiz by Pamela Sosna

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27 questions
Show answers
  • Q1
    What is a machine that is made of two simple machines called?
    pulley
    compound machine
    simple machine
    lever
    30s
  • Q2
    What is it called when a force causes an object to move in the same direction that the force is being applied?
    force
    power
    energy
    work
    30s
  • Q3
    Which of the following prevents machines from being 100% efficient?
    power
    output force
    friction
    input force
    30s
  • Q4
    If you closely examine a screw, you will see that the threads on it form a long _________________ wrapped around a cylinder.
    inclined plane
    wedge
    pulley
    wheel and axle
    30s
  • Q5
    A device that makes work easier by changing the size or direction of force is called what?
    watt
    power
    machine
    force
    30s
  • Q6
    The rate at which energy/work is transformed is called what?
    joule
    work
    energy
    power
    30s
  • Q7
    What does a fixed pulley change?
    the timing of the force
    the direction of the force
    the speed of the force
    the size of the force
    30s
  • Q8
    A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?
    40.7 N
    2640 N
    87.3 N
    5.5 N
    120s
  • Q9
    Chris and Jane are lifting boxes to put them on shelves. Chris does 200 J of work in 5 min, and Jane does 200 J of work in 4 min. What is the difference between the two jobs?
    the output force
    the work
    the input force
    the power
    60s
  • Q10
    In which situation is a person doing work on an object?
    A student exerts 1N of force on their locker that won’t open.
    A student picks up a book that weighs 10 N.
    A student holds a backpack 1 m off the floor.
    A student walks forward while wearing a backpack that weighs 15 N
    60s
  • Q11
    Greg applies a force of 100 N to move a box 5 meters. How much work did he do?
    500 J
    500 N
    5 J
    100 J
    60s
  • Q12
    What is the work that you do on a machine called?
    work input
    lever
    power
    work output
    30s
  • Q13
    The greater the ratio of an inclined plane’s length to its height, the greater the
    mechanical efficiency
    mechanical advantage
    power
    work
    30s
  • Q14
    How much work is done lifting a 5 kg ball from a height of 2 m to a height of 6 m? (Use 9.8 m/s2 for the acceleration of gravity.)
    98 J
    392 J
    196 J
    294 J
    120s
  • Q15
    A construction worker is lifting a load of bricks onto a truck and he does 200 J of work in 40 s. What is his power output?
    50 W
    50 J
    5 J
    5 W
    120s

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