[SC2015] PS8 (8) 8 :
8 ) Use Newton's first law to demonstrate and explain that an object is either at rest or moves at a constant velocity unless acted upon by an external force (e.g., model car on a table remaining at rest until pushed).
[SC2015] PS8 (8) 9 :
9 ) Use Newton's second law to demonstrate and explain how changes in an object's motion depend on the sum of the external forces on the object and the mass of the object (e.g., billiard balls moving when hit with a cue stick).
[SC2015] PS8 (8) 10 :
10 ) Use Newton's third law to design a model to demonstrate and explain the
resulting motion of two colliding objects (e.g., two cars bumping into each
other, a hammer hitting a nail).*