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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
Newton's Second Law of Motion explains the relationship between
  1. mass, force, and velocity
  2. mass, force, and acceleration
  3. mass, acceleration, and static force
  4. velocity, force, and air resistance
Grade 9 Forces and Motion
Newton's Third Law gets help from the first two laws. Which aspects from those laws are necessary to help explain Newton's Third Law of Motion? (Check off 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
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 Forces and Motion
Horizontal lines on a velocity/time graph show
  1. constant acceleration
  2. no motion
  3. positive acceleration
  4. negative acceleration
Grade 9 Forces and Motion
Grade 9 Forces and Motion
If the net force on an object is zero, the the object has?
  1. reaction forces
  2. action forces
  3. balanced forces
  4. unbalanced forces
Grade 9 Forces and Motion
Why does a dropped feather hit the ground later than a rock dropped at the same time?
  1. The weight of the rock
  2. The mass of the rock
  3. The air resistance on the feather
  4. Feathers are designed for flight
Grade 9 Forces and Motion
What is the invisible force of attraction between masses?
  1. remote-sensing
  2. free-fall
  3. gravity
  4. ultraviolet radiation
  5. ozone concentration layer
  6. none of the above
Grade 9 Forces and Motion
Which of the following does NOT require direction?
  1. Velocity
  2. Acceleration
  3. Force
  4. Speed
  5. Displacement
Grade 9 Forces and Motion
Cars have difficulty stopping on ice because of
  1. rolling friction
  2. sliding friction
  3. fluid friction
  4. centripetal force
Grade 9 Forces and Motion
The amount of air resistance depends on the speed of a falling object and                                     
  1. the mass of the object
  2. gravitational pull of the Earth
  3. the time of day the object is falling
  4. amount of surface area of the object
Grade 9 Forces and Motion
Grade 9 Forces and Motion
If a ball rolls down an inclined plane and picks up a speed of 4 m/s each second it rolls, its acceleration is
  1. one half of 4 m/s
  2. one half of 4 m/s squared
  3. 4 m/s squared
  4. 10 m/s squared
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