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Eighth Grade (Grade 8) Forces and Motion Questions

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Grade 8 Forces and Motion
Which is a unit of speed?
  1. m/s
  2. s
  3. kg
  4. hr
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 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
Grade 8 Forces and Motion
You can increase friction by
  1. making the surfaces rougher.
  2. using oil or another lubricant.
  3. putting the object on wheels.
  4. asking a friend to help push or pull.
Grade 8 Forces and Motion
If two forces act on an object in opposite directions, the net force
  1. is the difference of the two forces.
  2. is the sum of the forces.
  3. is the only one of the forces can act on the object.
  4. cannot be determined.
Grade 8 Forces and Motion
Which shows the formula for acceleration?
  1. A=VF-VITF-TI
  2. F=M×A
  3. V=dt
  4. A=ΔTΔV
Grade 8 Forces and Motion
In which of these do you need to know the direction in which the object is moving?
  1. velocity
  2. instantaneous speed
  3. average speed
  4. mass
Grade 8 Forces and Motion
How fast something moves over a certain distance
  1. length
  2. instantaneous speed
  3. average speed
Grade 8 Forces and Motion
Earth rotates west to east. According to Newton's first law of motion, which should occur if you jumped straight up?
  1. you land east of where you jumped from
  2. you land west of where you jumped from
  3. you land in the same place you jumped from
Grade 8 Forces and Motion
A Newton is equal to                                .
  1. the amount of mass in an object
  2. mass times velocity
  3. mass times speed
  4. mass times acceleration
Grade 8 Forces and Motion
Use the data table to calculate the acceleration of the object in question.
Data Table - Positive Acceleration
  1. 2m/s/s
  2. 8m/s/s
  3. 20m/s/s
  4. 32m/s/s
Grade 8 Forces and Motion
The formula for velocity is v=distance x time.
  1. True
  2. False
Grade 8 Forces and Motion
Which is NOT true about balanced forces?
  1. are equal in size
  2. act in the same direction
  3. do not cause a change in motion
  4. act in opposite directions
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