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Ninth Grade (Grade 9) Forces and Motion Questions

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Grade 9 Forces and Motion
Grade 9 Forces and Motion
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
An astronaut drops a hammer and an egg while standing on the surface of the Moon. Which one will hit the surface first?
  1. the egg
  2. the hammer
  3. both will land at the same time
  4. neither, both will float off into space
Grade 9 Forces and Motion
Newton's First Law is also known as
  1. The Law of Velocity.
  2. The Law of Gravity.
  3. The Law of Inertia.
  4. The Law of Conservation.
  5. The Law of the Land.
Grade 9 Forces and Motion
A change in position is called                .
  1. motion
  2. displacement
  3. acceleration
  4. velocity
Grade 9 Forces and Motion
Grade 9 Forces and Motion
Grade 9 Forces and Motion
Grade 9 Forces and Motion
Grade 9 Forces and Motion
What is the formula for speed?
  1. speed=distance/displacement
  2. speed=time/speed
  3. speed=time/distance
  4. speed=distance/time
Grade 9 Forces and Motion
Grade 9 Forces and Motion
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
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
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
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