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Eighth Grade (Grade 8) Mechanics Questions

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Grade 8 Forces and Motion
Which shows the formula for velocity?
  1. A=ΔVΔt
  2. V=dt
  3. F=M×A
  4. N=1Kg×1ms2
Grade 8 Forces and Motion
Which law of motion states that an object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an unbalanced force?
  1. Newton's 1st Law of Motion
  2. Newton's 2nd Law of Motion
  3. Newton's 3rd Law of Motion
Grade 8 Forces and Motion
                  is the motion of an object in a complete circle.
  1. Rotational motion
  2. Periodic motion
  3. Linear motion
Grade 8 Forces and Motion
Which force results from relative motion between objects?
  1. net force
  2. inertia
  3. friction
Grade 8 Forces and Motion
Which law of motion explains how a rocket lifts off the ground?
  1. Newton's 1st Law of Motion
  2. Newton's 2nd Law of Motion
  3. Newton's 3rd Law of Motion
Grade 8 Forces and Motion
Which of the following is the unit of measurement for force?
  1. friction
  2. newton
  3. weight
Grade 8 Forces and Motion
Which law of motion states that every action has an equal and opposite reaction?
  1. Newton's 1st Law of Motion
  2. Newton's 2nd Law of Motion
  3. Newton's 3rd Law of Motion
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. 15ms2
  3. 150 N
  4. 15,000kg⋅ms
Grade 8 Forces and Motion
Which is a unit of speed?
  1. m/s
  2. s
  3. kg
  4. hr
Grade 8 Energy and Momentum
As a pendulum swings back and forth,
  1. potential energy is transformed into kinetic energy.
  2. kinetic energy is transformed into potential energy.
  3. at the lowest part of its swing, its energy is all kinetic.
  4. at the end points of its swing, its energy is all potential.
  5. all of the above.
Grade 8 Forces and Motion
Which describes velocity?
  1. acceleration in a direction
  2. speed that is changing
  3. speed in a given direction
  4. acceleration over a distance
Grade 8 Energy and Momentum
Kinetic energy of an object is equal to what?
  1. one half the product of its mass and speed squared.
  2. one half the product of its mass and its speed.
  3. its mass multiplied by its speed.
Grade 8 Energy and Momentum
Microwaves, radio waves, and X-rays are all examples of what kind of energy?
  1. Mechanical
  2. Thermal
  3. Electromagnetic
  4. Sound
Grade 8 Forces and Motion
The combination of all forces acting on an object is
  1. the net force.
  2. constant speed.
  3. no motion, therefore no acceleration.
  4. static friction.
Grade 8 Forces and Motion
                is how far objects are from each other.
  1. Displacement
  2. Distance
  3. Velocity
  4. Reference point
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