Newton’s 1st Law.

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Presentation transcript:

Newton’s 1st Law

Who is Newton? What is physics? 1643-1727 physicist calculus astronomer Laws of Motion What is physics? Law of Universal Gravitation mathematician

Isaac Newton Bio

In this unit, we will be focusing on Newton’s Laws of Motion. Newton’s 1st Law of Motion is all about INERTIA What’s Inertia, you ask? Let’s find out!

1-Inertia-Eureka edited

Inertia is the tendency of an object to keep doing So... Inertia is the tendency of an object to keep doing whatever it’s already doing. Let’s see if you’ve got it...

1. If an object is moving, it wants to... keep moving stop moving change direction 2. If an object is sitting still, it wants to... start moving keep sitting still jump up 3. If an object is going in a straight line, it wants to... continue in a straight line change direction increase speed

objects want to keep doing what they are already doing... So... objects want to keep doing what they are already doing... that’s INERTIA! Can anything affect Inertia? Let’s find out...

Newton’s 1st Law of Motion Inertia= object’s resistance to changing its motion. Things like to keep doing what they are already doing. “An object in motion will remain in motion, and an object at rest will remain at rest unless acted on by another force.” Newton’s 1st Law of Motion

2 mass-Eureka

Big mass means _____ Inertia big Let’s see if you’ve got it... Big mass means _____ Inertia Small mass means _____ Inertia big small and that means... it takes more force to start, stop, or change direction of a big mass.

4. What has the MOST inertia? empty box box filled with sand box filled with styrofoam peanuts 5. What takes the MOST force to stop? bicycle family car cruise ship 6. Put in order from LEAST to MOST inertia. 10 grams of steel 20 grams of sand 30 grams of water

Inertia Depends on MASS- how much “stuff” is in an object. Big Mass= Lots of Inertia (REALLY wants to keep doing what it’s doing, difficult to change) Small Mass= little inertia (easier to change what it’s doing) Inertia

What things have inertia? Is the inertia big (B) or little (L)? Item Describe or Draw what you saw. What things have inertia? Is the inertia big (B) or little (L)? What forces overcame (changed) the inertia? Coin in Cup Car Crash Eggs in Motion Ice Hockey Car on Curve Bus Ride

Now, it’s time to look at some “real world” examples of Newton’s 1st Law of Motion. For each item listed in the first column, you need to briefly: describe what you saw identify what things have big (B) and little (L) inertia identify pushes/pulls (forces)

Coin in Cup Coin Drop

Car Crash Car Crash

Eggs in Motion Eggs in Motion

CSI Bus Crash CSI Bus 1st

1st law Ice Hockey (no sound)

Car on a Curve

Bus Ride

Now it’s your turn to experience Newton’s 1st Law Follow your teachers directions to complete the mini-labs on the back of your worksheet.

Extras... more videos showing Newton’s 1st Law

Hoop Trick Hoop Demo