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

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

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Page 1: What occurs twice in a week, once in a year, but never in a day?

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

Page 2: What occurs twice in a week, once in a year, but never in a day?

Page 3: What occurs twice in a week, once in a year, but never in a day?

Page 4: What occurs twice in a week, once in a year, but never in a day?

Newton’s 1st Law of Motion

Page 5: What occurs twice in a week, once in a year, but never in a day?

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

Page 6: What occurs twice in a week, once in a year, but never in a day?

So What Is Inertia?

•Inertia can also be described as: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

Page 7: What occurs twice in a week, once in a year, but never in a day?

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)

Page 8: What occurs twice in a week, once in a year, but never in a day?

• 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?

Page 9: What occurs twice in a week, once in a year, but never in a day?

• 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?

Page 10: What occurs twice in a week, once in a year, but never in a day?

• 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?

Page 11: What occurs twice in a week, once in a year, but never in a day?

• 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?

Page 12: What occurs twice in a week, once in a year, but never in a day?

• Jonah Lomu: Very MASSIVE = Lots of INERTIA = HARD TO STOP

What Does Inertia Have To Do With Rugby?

Page 13: What occurs twice in a week, once in a year, but never in a day?

Really cool film clip

Page 14: What occurs twice in a week, once in a year, but never in a day?

Challenge!

• Why does my water bottle roll under my seat when leaving school!

Page 15: What occurs twice in a week, once in a year, but never in a day?

Challenge!

• Why do you shift left when you turn your car right?

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