Newton's laws

• Inertia is a resistance to a change in motion
• Newton's first law of motion states that an object will remain at rest or in uniform motion I a straight line unless acted upon by an external resultant force
• Newton's second law of motion can be described by the equation:

  resultant force = mass x acceleration
• Newton's second law can be stated as the acceleration of an object is directly proportional to the mass of the object
• Weight is the force of gravity acting on an object. It is measured in Newtons (N)
• Mass is the amount of matter in an object. It is measured in kilograms (kg)
• On earth, the gravitational field strength is approximately 10N/kg
• Terminal speed is the constant speed that an object reaches when moving through the air
• Newton's third law:

  If body A exerts a force on body B, then body B exerts an equal and opposite force on body A