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Ninth Grade (Grade 9) Simple Machines Questions

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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
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 choices best explains what Watts represent?
  1. joules per meter
  2. joules per second
  3. newtons per meter
  4. newtons per second
  5. meters per second
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
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
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
Grade 9 Simple Machines
An inclined plane with one or two sloping sides is called a
  1. axle
  2. screw
  3. wedge
  4. pulley
Grade 9 Simple Machines
Which of the following is true about a single, fixed pulley?
  1. It has a mechanical advantage less than 1.
  2. It has a mechanical advantage equal to 1.
  3. It has a mechanical advantage greater than 1.
  4. It has no friction.
Grade 9 Simple Machines
Which of the following could knowing the mechanical advantage of a machine tell you?
  1. If the machine increases the effort force.
  2. If the machine increases the effort distance.
  3. If the machine does not change your effort force.
  4. All of the above
Grade 9 Simple Machines
A standard bottle opener is an example of what type of lever?
  1. Class 1 Lever
  2. Class 2 Lever
  3. Class 3 Lever
  4. Class 4 Lever
Grade 9 Simple Machines
Which of the following would most likely make a machine more efficient?
  1. Increasing the Mechanical Advantage
  2. Increasing the effort distance by decreasing the effort force
  3. Increasing the effort force by decreasing the effort distance
  4. Decreasing the friction by using wheels or lubricant
Grade 9 Simple Machines
Tithi builds a ramp that allows her carry the enormous bags of money she made as a bioengineer up to her front door. She calculates that the ramp has an efficiency of 32%. What would be the best way to increase the efficiency of the ramp?
  1. increase her effort force
  2. increase the length of the ramp
  3. push the bags instead of pulling them
  4. place the bags on something with wheels
  5. use sandpaper to make the ramp rough so she gets more traction
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