Changes in speed or direction of motion are caused by forces. The greater
the force is, the greater the change in motion will be. The more massive
an object is, the less effect a given force will have.
| NSES Content Standard B
Physical Science: Position and motion of objects Grades K-4, page 127 The position and motion of objects can be changed by pushing or pulling. The size of the change is related to the strength of the push or pull. |