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Work (Grade 9)

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Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

A weightlifter holds an 800-newton barbell over his head at a height of 6 meters. How much work does the weight lifter do on the barbell?
  1. 0 J
  2. 0 W
  3. 4,800 J
  4. 4,800 W
When a pitcher tosses a baseball, which of the following is true?
  1. When the ball leaves his hand, he is no longer doing work on it.
  2. He is doing work on the ball until it stops or changes direction.
  3. He never does any work on the ball.
  4. Work is being done after the ball leaves his hand, but not before.
Which one is doing the most work?
  1. pulling a box 10 m with a force of 100 N
  2. pushing a box 100 m with a force of 200N
  3. pulling a sled 1000 m with a force of 10N
  4. pushing a car with a force of 100000 N and it doesn't move
A person walks up a staircase, and a second person runs up the staircase. Who does more work?
  1. the person who walks up
  2. the person who runs up
  3. same work is done in both situations
  4. impossible to determine without knowing their masses
Work and energy have the same units, Joules. If Kanisha pushes on a concrete wall and expends 50 Joules of energy, and the wall doesn't move, how much work do she do on the wall?
  1. 50 Joules
  2. more than 50 Joules
  3. 0 Joules
  4. between 0 Joules and 50 Joules
A person climbs a ladder to reach the second floor of his house. Later in the day, he walks up a flight of steps to reach the second floor. In which situation did he do more work?
  1. climbing the ladder
  2. using the steps
  3. same for both
  4. impossible to determine
If you halve the distance that a given force acts on an object, the work done will be                               .
  1. twice as much
  2. half as much
  3. the same
  4. none of these
Which of the following is an example of work (using the scientific definition)?
  1. A weight lifter holding a heavy bar above his head.
  2. A custodian pushing a broom across the gym.
  3. A student thinking of the answer to a test.
  4. A little brother pulling on a door that won't move because you locked it.
Which of the following best describes the concept of work?
  1. a force applied to an object
  2. a force moves an object through a distance
  3. the transformation of energy
  4. the rate at which energy is transformed
A force of 150 N is applied to a sphere which rolls 75 m. How much work has been done?
  1. 11,250 J
  2. 2 J
  3. 11,250 N
  4. 2 N
  5. None of the above
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