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Unit 4 Energy

Quiz by Kate Downey

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24 questions
Show answers
  • Q1
    What is the smallest time in which a 900 W motor can lift a 3500 kg elevator to a height of 9.50 m?
    293,265,000 seconds
    362 seconds
    368 seconds
    3.89 seconds
    30s
  • Q2
    How much work is required to lift a 25-kilogram mass to a height of 7 meters?
    3.57 J
    35 J
    175 J
    1,715 J
    30s
  • Q3
    Four machines do the amounts of work listed in the table shown. The time they take to do the work is also listed. Which machine develops the most power?
    Question Image
    A
    C
    D
    B
    30s
  • Q4
    Work is being done when a force
    is exerted by one team in a tug of war when there is no movement
    acts vertically on a cart that can only move horizontally
    is exerted while pulling a wagon up a hill
    of gravitational attraction acts on a person standing on the surface of the Earth
    30s
  • Q5
    The graph shows the force exerted on a block as a function of the block's displacement in the direction of the force. How much work did the force do in displacing the block 5.0 meters?
    Question Image
    4 J
    20 J
    .8 J
    0J
    30s
  • Q6
    Which pair of quantities can be expressed using the same units?
    acceleration and weight
    impulse and potential energy
    power and momentum
    work and kinetic energy
    30s
  • Q7
    How much work is done on a downhill skier by an average braking force of 9,256 newtons to stop her in a distance of 10 meters?
    92,560 J
    92,560 W
    .001 J
    925.6 J
    30s
  • Q8
    Which action would require no work to be done on an object?
    pushing the object along a horizontal floor against a frictional force
    lifting the object from the floor to the ceiling
    decreasing the speed of the object until it comes to rest
    olding the object stationary above the ground
    30s
  • Q9
    A pendulum swings as shown in the diagram. At which position is the kinetic energy of the pendulum bob the least?
    Question Image
    B
    A
    D
    C
    30s
  • Q10
    A pendulum swings as shown in the diagram. At which position is the gravitational potential energy of the pendulum bob the least?
    Question Image
    C
    A
    D
    B
    30s
  • Q11
    If the speed of an object is doubled, its kinetic energy will be...
    halved
    quadrupled
    doubled
    quartered
    30s
  • Q12
    A 75.0 kg person, starting from rest, slides down a slide 4.00 m long in 7 seconds. How much power is needed to stop the person from hitting the ground.
    420 J
    420 W
    42.9 J
    2,100 W
    30s
  • Q13
    A 1000 kg roller coaster travels over a 20.0 m tall hill and falls at a 5.00 m/s. What is the roller coasters KE?
    12,500 W
    10,000 J
    12,500 J
    10 J
    30s
  • Q14
    A student driving nails into a piece of wood lifts a 2.25 kg hammer 0.300 m above the top of a nail and then simply drops it on the nail. What is the gravitational PE of the hammer before he drops it down on the nail?
    6.62 W
    6.62 J
    .675 J
    .2 J
    30s
  • Q15
    According to the graph, the kinetic energy of the rock after 3 seconds is about ________.
    Question Image
    425 J
    400 J
    0J
    375 J
    30s

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