Which is NOT a "big idea" involving force and motion?

a) a force acting on an object in motion causes it to stop moving

b) a force acting on an object in motion causes it to change its motion

c) a force action on an object at rest causes it to move

The correct option is A.

The big idea involving force and motion is that a force can acts on an object at rest and cause it to be in motion. A force can also act on an object which is in motion and cause it to change its direction of motion. Many forces usually act on an object per time and the net force is the sum of all the forces that are acting on the object.