Identify changes in motion (change direction, speeding up, slowing down).
Develop an understanding that the position and/or motion of an object is relative to a point of reference. Understand forces affect the motion and speed of an object and that the net force on an object is the total of all of the forces acting on it. Understand the Earth pulls down on objects with a force called gravity. Develop an understanding that some forces are in direct contact with objects, while other forces are not in direct contact with objects.
An object is in motion when its position is changing. The speed of an object is defined by how far it travels in a standard amount of time.