Describe the action and reaction forces that occur as you walk along a path.

Action forces is as a result of mass of your body times the acceleration of your motion.

Force = Mass × Acceleration (Newton's second law of motion)

Reaction Forces are as a result of friction force between you and the ground plus air, acting opposite to the direction you are heading. This is described in Newton's third law of motion which states that:

For every action, there must be an opposite and equal reaction.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me