Inertia

• Newtons Third Law states that when 2 objects interact, the forces they exert on each other are opposite and equal.
• Inertial Mass - a measure of how difficult it is to change the velocity of an object. The ratio of force over acceleration.
• Inertia - the tendency of an object to stay stationary or continue at a constant velocity.
• Newton's third law also applies to 2 objects that aren't touching. They could be interacting at a distance e.g. gravitational attraction