Key Idea: A moving object will maintain the same speed and direction of motion unless a force acts on it.

Students are expected to know that:

  1. If no forces (or forces that add to zero) act on a moving object, then the object will maintain a constant speed.
  2. If an object is maintaining a constant speed (or is at rest), then no forces (or forces that add to zero) are acting on it.


  1. Students are expected to analyze situations involving no more than two forces acting on an object at the same time, and each force must act along the object’s line of motion.
  2. Items will not include situations in which objects are at rest.
Percent of students answering correctly (click on the item ID number to view the item and additional data)
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Use of tables of speed versus time, and information about forces acting on an object, to determine the object's speed at various times.

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It is possible for an object to be moving at constant speed without a force pushing or pulling it.

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