Friction is a force that often opposes motion.
Students demonstrate their understanding of Force by
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A force is a push or a pull. Force can change the motion of an object.
If more than one force acts on an object along a straight line, then the forces will reinforce or cancel one another,depending on their direction and magnitude.
The greater the force, the greater the change.
Diagramming or describing, after observing a moving object, the forces acting on the object before and after it is put into motion (Students include in their diagram or description, the effect of these forces on the motion of the object.)
An object that is not subjected to a force will continue to move at a constant speed and in a straight line.