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Ninth Grade (Grade 9) Forces and Motion 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 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 Forces and Motion
Friction within machinery increases efficiency.
  1. True
  2. False
Grade 9 Forces and Motion
Distance traveled per unit of time is                .
  1. velocity
  2. speed
  3. motion
  4. acceleration
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
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 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 third law of motion?
  1. If an object applies a force on another object, the latter will stop moving.
  2. If an object exerts a force on another object, then the latter must exert a force of equal magnitude and opposite direction back on the first object
  3. If an object exerts a force on another object, the object's velocity will cut into half.
  4. If an object exerts a force on another object, nothing happens.
Grade 9 Forces and Motion
What is Newton's second law of motion?
  1. An object's mass depends directly on the acceleration of the object.
  2. An object's acceleration is indirectly related to an object's mass.
  3. The acceleration of an object is directly related to the net force and inversely related to its mass.
  4. The acceleration of an object is not related to the net force and is directly proportional to its mass.
Grade 9 Forces and Motion
An object will move if the forces acting on it are                .
  1. negative
  2. unbalanced
  3. balanced
  4. positive
Grade 9 Forces and Motion
Two different forces acting on a falling leaf are                                  .
  1. gravity and air resistance
  2. air resistance and fluid friction
  3. gravity and static friction
  4. weight and rolling friction
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
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
Not all moving parts are subject to friction.
  1. True
  2. False
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