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Ninth Grade (Grade 9) Mechanics Questions

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Grade 9 Forces and Motion
The weight of an object                                                   .
  1. stays the same wherever the object is.
  2. changes if the object is in motion.
  3. stays the same as long as the object is in motion.
  4. changes if the force of gravity changes.
Grade 9 Energy and Momentum
An example of the conversion of gravitational potential energy into kinetic energy is                             .
  1. a falling raindrop
  2. a gasoline powered engine
  3. striking a match
  4. a hockey puck sliding on ice
Grade 9 Forces and Motion
Seat belt laws are a good idea because of which of the following law of motion?
  1. Newton's second law of motion
  2. Newton's first law of motion
  3. Newton's third law of motion
  4. Murphy's law of motion
  5. None of the above
Grade 9 Energy and Momentum
Mechanical energy is                                                         .
  1. found in machinery only
  2. usually measured at the atomic level
  3. the sum of the chemical and thermal energy of an object
  4. the sum of the kinetic and potential energy of an object
Grade 9 Energy and Momentum
Which form of energy does a plant store when light is transformed during photosynthesis?
  1. chemical energy
  2. thermal energy
  3. mechanical energy
  4. electrical energy
Grade 9 Energy and Momentum
Potential energy + kinetic energy is equal to                               .
  1. gravitational potential energy
  2. thermal energy
  3. chemical energy
  4. mechanical energy
Grade 9 Forces and Motion
Friction within machinery increases efficiency.
  1. True
  2. False
Grade 9 Forces and Motion
Which of the following is a scalar quantity?
  1. acceleration
  2. displacement
  3. distance
  4. momentum
Grade 9 Forces and Motion
Distance traveled per unit of time is                .
  1. velocity
  2. speed
  3. motion
  4. acceleration
Grade 9 Energy and Momentum
Newton's Third Law of Motion is also called the                    .
  1. law of inertia
  2. law of momentum
  3. law of velocity
  4. law of acceleration
Grade 9 Energy and Momentum
Energy stored in the bonds between atoms is called
  1. kinetic energy.
  2. mechanical energy.
  3. chemical energy.
  4. thermal energy.
Grade 9 Forces and Motion
Newton's Third Law gets help from the first two laws. Which aspects of those laws are necessary to help explain Newton's Third Law of Motion? Select all answers that apply.
  1. An object in motion tends to stay in motion
  2. An object at rest tends to stay at rest
  3. Force equals mass times acceleration
  4. The greater the mass is, the greater the force necessary to accelerate that mass is
  5. The acceleration of an object is parallel and directly proportional to the force created
  6. For every action, there is an equal and opposite reaction
  7. Apples hurt when they land on your head
Grade 9 Forces and Motion
What is Newton's first law of motion?
  1. An object will not be in motion until acted on by an unbalanced force.
  2. An object in motion will continue in motion unless acted on by an unbalanced force
  3. A body moving moving in a straight line will continue moving in a straight line until disturbed on by an unbalanced force
  4. None of the above.
Grade 9 Energy and Momentum
The total amount of kinetic and potential energy in a system is called
  1. chemical energy.
  2. mechanical energy.
  3. radiant energy.
  4. thermal energy.
Grade 9 Forces and Motion
An object will move if the forces acting on it are                .
  1. negative
  2. unbalanced
  3. balanced
  4. positive
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