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Eighth Grade (Grade 8) Forces and Motion Questions

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Grade 8 Forces and Motion
A speedometer allows you to determine which of these?
  1. average speed
  2. average velocity
  3. instantaneous speed
  4. displacement
Grade 8 Forces and Motion
Forces that must touch the object that they push or pull are called
  1. friction forces.
  2. mechanical forces.
  3. energy forces.
  4. contact forces.
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
A force gives energy to an object will cause it to                  .
  1. stop moving
  2. start moving
  3. change its motion
  4. all of the above
Grade 8 Forces and Motion
What determines how much friction occurs between two surfaces?
  1. distance the object is pulled along the surface
  2. how fast the objects are moving
  3. how hard you push or pull the objects
  4. the amount of force pushing the objects together and how irregular the surfaces
Grade 8 Forces and Motion
Which best describes the motion of the object recorded in data table?
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
9.81ms2 is commonly used to represent the
  1. speed of light.
  2. acceleration due to Earth's gravity.
  3. coefficient of friction.
  4. acceleration of objects in a fluid.
Grade 8 Forces and Motion
A force exerted when matter is pulled or stretched is                .
  1. Newton
  2. compression
  3. balanced forces
  4. tension
Grade 8 Forces and Motion
A place or object used for comparison to determine if something is in motion is called
  1. a position.
  2. a reference point.
  3. a constant.
  4. velocity.
Grade 8 Forces and Motion
Objects with balanced forces acting on them are not moving or                  .
  1. static
  2. compression
  3. unbalanced forces
  4. gravity
Grade 8 Forces and Motion
The attractive force that exists between any two objects that have mass is known as
  1. acceleration.
  2. velocity.
  3. gravity.
Grade 8 Forces and Motion
This changes whenever the speed or direction of an object changes.
  1. speed
  2. direction
  3. velocity
  4. process
Grade 8 Forces and Motion
What is the SI unit for force?
  1. newton
  2. joule
  3. lilogram
  4. m/s/s
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