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Ninth Grade (Grade 9) Mechanics Questions

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Grade 9 Forces and Motion

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It is possible the rubber band is applying a force to the paper ball even when the ball is not moving.
  1. True
  2. False
Grade 9 Forces and Motion
Which of Newton's laws states that an object at rest tends to stay at rest, and that an object in motion tends to stay in motion, unless acted upon by an external force?
  1. Newton's First Law of Motion
  2. Newton's Second Law of Motion
  3. Newton's Third Law of Motion
  4. None of the above
Grade 9 Forces and Motion
What kind of friction force occurs as a fish swims through water?
  1. static
  2. rolling
  3. sliding
  4. fluid
Grade 9 Forces and Motion
Which of the following are action and reaction forces involved?
  1. When stepping from a curb
  2. When a tennis racket strikes a tennis ball
  3. When rowing a boat
  4. All of the possible answers
Grade 9 Energy and Momentum
If no friction acts on a diver during a dive, then which of the following statements is TRUE?
  1. The total mechanical energy of the system increases
  2. Potential energy can be converted into kinetic energy but not vice versa
  3. (KE + PE) beginning = (KE + PE) end
  4. all the above
Grade 9 Forces and Motion
A man will exert the greatest pressure on a bench when he                           .
  1. lies flat on his back
  2. lies flat on his belly
  3. stands on both feet
  4. stands on toes of one foot
Grade 9 Forces and Motion
A stone is tied to a string and whirled round. What type of motion does the system execute?
  1. circular
  2. rotational
  3. simple harmonic
  4. spin
Grade 9 Energy and Momentum
Jestin built a ramp to help move stuff up into the back of his scary van. If he uses the ramp to help him do work, which of the following will be true?
  1. His effort force and effort distance will remain the same. His MA = 1.
  2. His effort distance will decrease, his effort force will increase. His MA > 1.
  3. His effort distance will increase, his effort force will decrease. His MA > 1.
  4. His effort force will increase, his effort distance will decrease. His MA < 1.
Grade 9 Energy and Momentum
The diagram below shows an inelastic collision.
Elastic Collision
  1. True
  2. False
Grade 9 Fluid Mechanics
Which of the following does Bernoulli's principle help to explain?
  1. why water expands when it freezes
  2. why umbrellas turn inside out on windy days
  3. why condensation occurs on a cold glass of lemonade
  4. why moving cars take longer to stop on ice than on dry pavement
Grade 9 Fluid Mechanics
The pressure at a point in a liquid                                            .
  1. always acts vertically downwards
  2. is proportional to the volume of the liquid
  3. is equal to the atmospheric pressure
  4. is distributed equally in all directions
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