**SP2. Obtain, evaluate, and communicate information about how forces affect the motion of objects. **

a.Construct an explanation based on evidence using Newton’s Laws of how forces affect the acceleration of a body.

Explain and predict the motion of a body in absence of a force and when forces are applied using Newton’s 1st Law (principle of inertia).

Calculate the acceleration for an object using Newton’s 2nd Law, including situations where multiple forces act together.

Identify the pair of equal and opposite forces between two interacting bodies and relate their magnitudes and directions using Newton’s 3rd Law.

Develop and use a model of a Free Body Diagram to represent the forces acting on an object (both equilibrium and non-equilibrium).

Use mathematical representations to calculate magnitudes and vector components for typical forces including gravitational force, normal force, friction forces, tension forces, and spring forces.

**Learning Target:** I can identify action/reaction pairs.

**Activities:** Review notes on Newton’s 2nd law. Lab: Scales & clamps, worksheet phzjob day at the races, conceptual physics Newton’s 2^{nd} law