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Ninth Grade (Grade 9) Simple Machines Questions

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Grade 9 Simple Machines
A device that does work with only one movement is called a
  1. pulley
  2. compound machine
  3. force
  4. simple machine
Grade 9 Simple Machines
How much work would be required to lift a 25 kg object to a height of 20 meters?
  1. 500 Joules
  2. 1.25 Joules
  3. 245 Newtons
  4. 1.25 Newtons
  5. 4900 Joules
Grade 9 Simple Machines
How would you increase the mechanical advantage of a doorknob?
  1. increase the radius of the outer knob
  2. increase the radius of the inner cylinder
  3. decrease the radius of the outer knob
  4. The mechanical advantage of a doorknob is always 1
  5. A doorknob is not a simple machine
Grade 9 Simple Machines
The force you apply to a machine is the
  1. efficiency
  2. input force
  3. output force
  4. resistance
Grade 9 Simple Machines
How much work is done when a 1200N object is raised 6 meters?
  1. 200 Joules
  2. 200 Newtons
  3. 7200 Joules
  4. 7200 Newtons
  5. None of the above
Grade 9 Simple Machines
Abigail plunges a knife into a melon. She calculates that she did 60 Joules of work on the knife, but the knife only did 46 Joules of work on the melon. What best explains the difference?
  1. The knife reduced the force she applied to the knife
  2. Some of her mechanical energy was converted to other types of energy including waste heat instead of work
  3. She did her work on the melon, not the knife.
  4. The knife is not a simple machine, so it doesn't transfer work
  5. Her kinetic energy in the knife became potential energy in the melon.
Grade 9 Simple Machines
To increase the DISTANCE that a machine moves a load, you should:
  1. increase the MA
  2. decrease the MA
  3. make the MA 1
  4. Decrease the efficiency
  5. you can't change distance, only force
Grade 9 Simple Machines
When water turns a turbine at a dam, the kinetic energy of the falling water changes to mechanical energy of the spinning turbine. Which of the following is an accurate description of the situation?
  1. The turbine is providing potential energy to the water
  2. The total amount of energy in the system is decreasing
  3. The water is doing work on the turbine
  4. The total amount of energy is increasing
  5. The water is converting its kinetic energy to potential energy
Grade 9 Simple Machines
Which of the following machines ALWAYS increases your force?
  1. class 2 lever
  2. class 3 lever
  3. wheel and axle
  4. pulley
  5. no machine can increase your force
Grade 9 Simple Machines
Grade 9 Simple Machines
If you measured the distance a desk moved across the floor when pushed by a student, and were told the total amount of work done, what other piece of information could you use this information to calculate?
  1. How long it took to move the desk
  2. How much force was applied
  3. The speed of the desk
  4. The acceleration of the desk
  5. The power of the student
Grade 9 Simple Machines
To increase the mechanical advantage of a lever you should:
  1. increase the length of the effort arm
  2. increase the length of the resistance arm
  3. remove the fulcrum
  4. increase your effort force
  5. increase the weight of the load
Grade 9 Simple Machines
Hayden invents a new device. He and his friends calculate that by applying 200 Joules of work to the machine, it will produce 300 Joules of work. When he describes the invention to John, John says that his calculations are incorrect. What is the best reason for John's belief that Hayden is mistaken?
  1. There is no way to accurately measure the work that comes out of a machine
  2. The work output of a machine can never be larger than the work input
  3. Joules are only used to measure force, not work
  4. You do work on a machine, but the machine can only put out force
  5. There is no reason John should think Hayden is wrong since that result is possible
Grade 9 Simple Machines
A class 1 lever has the fulcrum positioned to give it a mechanical advantage of exactly 1. Which of the following must be true?
  1. The effort arm is larger than the resistance arm
  2. The resistance arm is larger than the effort arm
  3. The effort will be between the load and the fulcrum
  4. The load will be between the fulcrum and the effort
  5. The fulcrum will be in the exact center making both arms equal
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