RUGBY

﻿RUGBY... //**by: Hannah Taylor. Shayleigh Allen. Jordan Allen. Toby Chapman.**//

**VIDEO # ONE** ﻿ media type="youtube" key="cnzYTcjq5Qg" height="390" width="480" **VIDEO # TWO** media type="youtube" key="YMXomOLcaJM" height="390" width="480"

I'll relate Newton's three laws to tackling

__**Newton's First Law**__: An object at rest wants to stay at rest, and an object in motion stays in motion (unless acted on by an external force). The object is the ball carrier. He wants to stay in motion so he can reach the tryline. It is the tackler's job to provide that external force to bring him to rest.
 * In video:** 0:03sec. player number 9 passes the ball but the ball would not be able to move if the player dind not apply an external force to the ball. This allows the ball to travel through the air.

__** Newton's Second Law : **__ Force = mass times acceleration ( in general, F = dp/dt, the rate of change of momentum). The bigger they are, the more force required to stop them. Similarly the bigger they are if they're tacking you the less force it takes to stop you (since you're smaller and therefore less mass). In a big hit, there is a lot of force applied, and the ball carrier's momentum changes in a small space of time. **In video**: 0:20sec when player 10(dan carter!!!)s foot applys a huge external force to the ball, the ball travels far enough to go over the goal post. But if the player did not apply enought acceleration to the rugby ball, it wouldn't go as far.

__** Newton's Third Law: **__ For every force there is an equal and opposite reaction force. The force exerted by the tackler on the ball carrier is equal in size, but opposite in direction, to the force exerted by the ball carrier on the tackler. Which explains why if your tackling technique is not right, and you get your head in the wrong position the tackler could get injured, in fact we've seen tacklers get knocked out making a tackle on the footy field countless times. **In video**: 0:10sec the player who tackles the other player is hitting him with a force so the person in the blue top is reacting to the person in the red tops force.

When the player is kicking the ball they will you their larger muscles first such as, their hamstring and quadracept. then they will use their smaller muscles such as, gastrocnemius
 * __ Force summation __**