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Eighth Grade (Grade 8) Mechanics Questions

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Grade 8 Forces and Motion

This question is a part of a group with common instructions. View group »

A magician suddenly jerks a tablecloth out from under the dishes on a table. This best demonstrates
  1. an action-reaction pair of forces.
  2. that the dishes have inertia.
  3. that gravity tends to hold the dishes securely.
  4. that the dishes have no acceleration.
Grade 8 Forces and Motion
Bobby ran East, then North, then West, then South, around his block at a constant speed of 2 m/s. Which of the following statements is NOT true about Bobby's run?
  1. Bobby's velocity changed during his run.
  2. Bobby accelerated during his run.
  3. Bobby's speed increased during the run.
  4. The ground pushed on Bobby's feet with equal force that he applied to the ground.
Grade 8 Forces and Motion
Which best describes the motion of the object recorded in data table below?
Data Table - Positive Acceleration
  1. it does not move
  2. it maintains a constant velocity
  3. it undergoes positive acceleration
  4. it undergoes negative acceleration
Grade 8 Forces and Motion
Which best describes the motion of the object recorded in data table below?
Data Table - Constant Speed
  1. it does not move
  2. it maintains a constant velocity
  3. it undergoes positive acceleration
  4. it undergoes negative acceleration
Grade 8 Forces and Motion
Grade 8 Forces and Motion
                is how far between objects
  1. displacement
  2. distance
  3. velocity
  4. reference point
Grade 8 Forces and Motion
Grade 8 Forces and Motion
What is gravity?
  1. Newtons first law
  2. the force that objects exert on each other because of their masses
  3. the downward pull on the Earth
  4. the friction that an object has put on it
Grade 8 Forces and Motion
What is the momentum of a 30 gram ball whose velocity is 5 m/s south?
  1. 150 g-m/s south
  2. 6 g-m/s south
  3. 1.6 g-m/s south
  4. 300 g-m/s south
Grade 8 Forces and Motion
The momentum of a 1,500 kg car traveling at a velocity of 10 m/s is
  1. 15,000 N
  2. [math]15 m/s^2[/math]
  3. 150 N
  4. [math]15,000 kg*m/s[/math]
Grade 8 Forces and Motion
Air resistance is a type of
  1. motion
  2. friction
  3. velocity
  4. gravity
Grade 8 Forces and Motion
Grade 8 Forces and Motion

This question is a part of a group with common instructions. View group »

If an object has no net force acting on it, which of the following may be true?
  1. The object is standing still
  2. The object is moving at a constant velocity
  3. The object is slowing down.
  4. A and B
  5. All of the above
Grade 8 Forces and Motion
The acceleration of an object is directional proportional to the force acting on it and inversely proportional to its mass.
  1. Newton's 2nd Law of Motion
  2. Newton's 3rd Law of Motion
  3. Newton's 1st Law of Motion
Grade 8 Forces and Motion
Grade 8 Forces and Motion

This question is a part of a group with common instructions. View group »

When one object exerts a force on another, the second object exerts an equal and opposite force on the first.
  1. Newton's 1st Law of Motion
  2. Newton's 3rd Law of Motion
  3. Newton's 2nd Law of Motion
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