Physics
Force Pull or push measured in Newton First Law/Law of inertia No friction in space -> object will keep on moving unless acted upon A body at rest remains at rest or, if in motion, remains in motion at constant valocity unless acted on by a net external force Second Law acceleration is proportional to Force and inversely proportional to mass a = F/m => F=ma When equal force is applied in opp direction -> then object will not move When both kick the ball in same direction -> Force will be sum of two forces a = sigma F/m Fnet = ma -> second law of motion Third law Whenever one body exerts a force on a second body, then first body experiences a force that is equal in magnitude and opposite in direction to the force that it excerts. Mathematically, if a body A exerts a force F on body B, then B simultaneously exerts a for -F on A, or in vector equation form. For every action, there is an equal and opposite reaction. eg: swimmer pushing legs again...