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Ninth Grade (Grade 9) Mechanics Questions

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Grade 9 Forces and Motion
What is speed?
  1. a change in position
  2. distance traveled per unit of time
  3. the rate of change of velocity
  4. measure of how far an object has moved
Grade 9 Forces and Motion
The constant force of attraction between all objects with mass is called
  1. inertia.
  2. adhesion.
  3. gravity.
  4. electromagnetism.
Grade 9 Forces and Motion
What is distance?
  1. a change in position
  2. a measure of how far an object has moved
  3. the distance and direction of an object's change on position from a reference point
  4. the distance traveled per unit of time
Grade 9 Forces and Motion
Which of the following is the unit of force?
  1. N
  2. Kg
  3. W
  4. J
Grade 9 Forces and Motion
You can reduce friction, but you cannot avoid it.
  1. True
  2. False
Grade 9 Forces and Motion
IF we consider a planet in orbit around the Sun as an example of object moving in circular motion, what best represents the centripetal force?
  1. The inertia of the planet moving forward in a straight line
  2. The momentum of the planet moving forward in a straight line
  3. The mass of the planet and the Sun
  4. The gravitational pull of the Sun
Grade 9 Energy and Momentum
The ability of a body to do work is its                .
  1. power
  2. momentum
  3. inertia
  4. energy
Grade 9 Energy and Momentum
When a car burns fuel, which of the following best describes what happens to the energy of the system?
  1. Chemical energy is used and destroyed in the process
  2. Chemical energy is transformed to mechanical energy and some waste heat
  3. Mechanical energy is created
  4. Mechanical energy is transformed into chemical energy
Grade 9 Forces and Motion
If you apply a force to an object with a known mass, what can you determine using Newton's second law?
  1. The object's acceleration
  2. The object's momentum
  3. The object's inertia
  4. The object's power
Grade 9 Energy and Momentum
If an object's speed doubles, its kinetic energy                .
  1. doubles
  2. quadruples
  3. stays the same
  4. is halved
Grade 9 Forces and Motion
The slope of the straight-line displacement time graph indicates                        .
  1. acceleration at instant
  2. distance traveled
  3. uniform acceleration
  4. uniform velocity
Grade 9 Energy and Momentum
Photosynthesis, the process where plants use light to make food, is an example of
  1. energy being created.
  2. work being done.
  3. light energy being transformed to chemical energy.
  4. power being used.
Grade 9 Forces and Motion
Which of the following is not an example of a force?
  1. tension
  2. weight
  3. friction
  4. mass
Grade 9 Forces and Motion
A moment is the product of
  1. force and speed.
  2. acceleration and perpendicular distance.
  3. perpendicular distance and force.
  4. parallel distance and weight.
Grade 9 Energy and Momentum
Kaylee and Jessica were moving boxes of quiz bowl questions. They each moved 10 boxes. Jessica moved the 10 boxes in 30 minutes, while Kaylee did it in 20 minutes. Assuming the boxes required the same amount of force to move, and they were all moved the same distance, which of the following is true?
  1. Kaylee did more work than Jessica, because she did it faster.
  2. Jessica did more work than Kaylee, because she worked longer.
  3. Kaylee had more power than Jessica but did not do more work.
  4. None of the above are true.
Grade 9 Energy and Momentum
Which is true about using energy?
  1. When energy is used, it disappears forever.
  2. When energy is used, it can transform to new types but can never disappear.
  3. There is an unlimited amount of energy in the universe.
  4. A falling object increases its total energy.
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