Name: ________________________________ Date: ____ /______/ _______ Class No: _____

NEWTON'S FIRST LAW-INERTIA NOTES: What is Inertia?

Pre-questions 1.) A bowling ball that is rolling at 3m/s takes more force to stop than a tennis ball rolling at 3m/s. Thus, we can say an object that has more mass has a [ higher / lower ] inertia.

2.) Suppose you have a bowl of water (nearly full) on the table and you push the bowl to slide it across the table. What happens to the water inside the bowl?

3.) Suppose you are carrying a bowl of water (nearly full) at a constant speed and all of a sudden you come to a complete stop. What happens to the water inside the bowl? When the bowl came to a stop, what did the water want to keep doing?

Newton’s First Law - ________________________________________________________________________________

Demo: Index Card FlickPrediction: Write what you expect to see… What did the index card do?

What did the coin do?

Explanation:What forces were acting on the coin when it was on the index card?

What does the coin have since it has mass?

Demo: Tablecloth JerkPrediction: Write what you expect to see… What did the tablecloth do?

What did the stuff on top of the tablecloth do?

Explanation:What forces were acting on the book when the tablecloth was on the table?

Explain what happened using Newton’s First Law.

Demo: Crash Test Dummies Without SeatbeltPrediction: Write what you expect to see… What did the car do?

What did the dummies do?

Explanation:Why did the bodies behave the way they did?

How do seatbelts help us in accidents? (explain using Newton’s First Law)

Demo: Spinning EggPrediction: Write what you expect to see… What did the egg do when I put my hand on it?

What did the egg do when I took my hand off the egg?

Explanation:If I stopped the egg with my hand, what must have been applied for it to behave the way it did when I took my hand off?

What is in an egg that could have done this?

Explain using Newton’s First Law, why the egg behaved the way it did.