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Eighth Grade (Grade 8) Mechanics Questions

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Grade 8 Forces and Motion
The size or amount of a force is known as its                .
  1. net force
  2. direction
  3. magnitude
  4. constant speed
Grade 8 Fluid Mechanics
Bernoulli's principle states that                                                              .
  1. pressure is transmitted equally through a fluid
  2. pressure increases as temperature decreases
  3. buoyant force equals weight of fluid displaced
  4. pressure in a fluid decreases as speed of the fluid increases
Grade 8 Forces and Motion
In the formula for speed, you must
  1. multiply the distance and the time.
  2. add the distance and the time.
  3. divide the distance by the time.
  4. multiply the speed and the time.
Grade 8 Forces and Motion

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

Motion is
  1. anything with speed.
  2. the change of position over time.
  3. the way you move something.
  4. an object with force.
Grade 8 Forces and Motion
Which shows the formula for calculating speed?
  1. Speed = time x position
  2. Speed = time x mass
  3. Speed = distance/time
  4. Speed = time/velocity
Grade 8 Forces and Motion
Motion can be measured by                 .
  1. speed
  2. velocity
  3. acceleration
  4. all of the above
Grade 8 Forces and Motion
Newton's second law of motion states the relationship of mass, acceleration, and force. It states that
  1. force equals mass divided by acceleration.
  2. force equals acceleration divided by mass.
  3. force equals mass times acceleration.
  4. every object attracts every other object in the universe.
Grade 8 Mechanics
This is a quantity that has both size and direction.
  1. Average speed
  2. Speed
  3. Velocity
  4. Vector
Grade 8 Forces and Motion
An example of rolling friction is
  1. using oil to lubricate.
  2. wheels on your skateboard.
  3. dragging your sister across the floor on a blanket.
  4. the little mermaid swimming through the ocean.
Grade 8 Energy and Momentum
The movement of molecules in matter is                 energy.
  1. chemical
  2. thermal
  3. electromagnetic
  4. electrical
Grade 8 Energy and Momentum
The unit for measuring energy is                .
  1. Degrees
  2. Newtons
  3. Joules
  4. Watts
Grade 8 Forces and Motion
Which law of motion is explained by the equation: Force = mass x acceleration?
  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
A velocity-time graph of a moving object is shown. Which statement best describes the object's velocity between points D and E?
Velocity Vs. Time
  1. The object's velocity is increasing.
  2. The object's velocity is decreasing.
  3. The object's velocity is constant.
  4. The object is stopped.
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