Newtons laws

• Terminal Velocity

  The maximum speed of an object, because the resultant force acting on it is zero
• Three Stages of falling

  1. Falling through a liquid/gas: At the start, object accelerates downwards due to the force of gravity

  2. As speed increases, frictional forces increase (Air resistance). Object reaches terminal velocity when the resultant force is zero

  3. The weight of an object doesn't change as it falls
• Newton's First Law: An object remains in the same state of motion unless a resultant force acts on it
• Newton's Second Law: The resultant force acting on an object is proportional to the acceleration of the object
• Newton's Third Law: When two objects interact, they exert equal and opposite forces on each other
• Inertia


  The tendency of an object to continue in its current state (at rest, in uniform motion).
• skydiver

  When a resultant force acts on an object, it accelerates downwards due to gravity. The weight stays the same. There is still a resultant force acting downwards. Eventually, it reaches terminal velocity. When the parachute opens, air resistance increases. The skydiver slows down
• Inertial mass

  A measure of how difficult it is to change the velocity of an object