What occurs twice in a week, once in a year, but never in a day?

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Newton’s First Law (law of inertia).

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Presentation transcript:

What occurs twice in a week, once in a year, but never in a day?

Newton’s 1st Law of Motion

Newton’s 1st Law Newton’s 1st Law: An object at rest stays at rest and an object in motion stays in motion, unless acted upon by an unbalanced (i.e. net or outside) force This motion is in a straight line, at a constant speed Often called an objects inertia

So What Is Inertia? Inertia can also be described as: State of Motion? The resistance an object has to changes in its state of motion State of Motion? An object can either be in motion (traveling in a direction at a constant speed) or at rest (stationary, thus NO speed) More Mass = More Inertia = More Resistant to Changing Its Motion

What Does Inertia Have To Do With Rugby? Jonah Lomu: New Zealand All Blacks Mass: 120 kg (translates to 273 lbs) Height: 6’ 5’’ Speed: Runs 100 meters in 10.8 seconds (Carl Lewis: 100 meters in 9.88 seconds)

What Does Inertia Have To Do With Rugby? Jonah Lomu: Very Big (lots of mass – 120 kg) Very Fast Lots of Inertia Because of Large Mass (i.e., large amount of inertia) he is very resistant to changes in motion HARD TO STOP WHEN MOVING HARD TO START MOVING WHEN AT REST

What Does Inertia Have To Do With Rugby? So when Jonah Lomu is in motion and encounters someone less massive (i.e., with less INERTIA)… HE IS MORE RESISTANT TO THEIR ATTEMPTS TO CHANGE HIS STATE OF MOTION (i.e., bring him to a rest)

What Does Inertia Have To Do With Rugby? So when Jonah Lomu is at rest and encounters someone less massive (i.e., with less INERTIA)… He is more resistant to their attempts to change his motion.

What Does Inertia Have To Do With Rugby? Because of his mass, it is harder to change his direction when in motion. WHY? INERTIA! Straight Line Motion Inertia resists changes in motion (in this case the DIRECTION of the motion) The GREATER the MASS, the HARDER it is to CHANGE DIRECTION

What Does Inertia Have To Do With Rugby? Jonah Lomu: Very MASSIVE = Lots of INERTIA = HARD TO STOP

Really cool film clip https://www.youtube.com/watch?v=yamhc4DaNKo 0:37 onward with no sound. First his inertia lets him go forward. Scond other, smaller peoples, inertia doesn’t allow them to keep going.

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