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Newton / 1 st Law of Motion - PowerPoint PPT Presentation

Newton / 1 st Law of Motion. October 22, 2012. Sir Isaac Newton. One of the most important scientists… EVER!!! He lived from 1642 to 1727 He came up with 3 LAWS OF MOTION as well as the universal law of gravitation We’ll be talking about the three laws of motion starting today

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Newton / 1st Law of Motion

October 22, 2012

• One of the most important scientists… EVER!!!

• He lived from 1642 to 1727

• He came up with 3 LAWS OF MOTION as well as the universal law of gravitation

• We’ll be talking about the three laws of motion starting today

• We’ll come back to the universal law of gravitation after Thanksgiving

• Even though his discoveries are about 300 years old, they are still used today!

• Each group will get a cup, a card, and a penny

• Put the card flat on top of the cup and the penny on top of the card

• Your group has to figure out how to remove the card so that the penny falls directly into the cup, but:

• No part of the card can rise above its initial location

• Pretend like your fingers have ink on them, no fingerprints should be on the card (you can hold the cup if you want, though)

• You have 2 minutes to discuss what your strategy will be with your group and write it down in your notes

• Then you have 3 minutes with the materials to see if you can figure out how to actually do it

• Newton’s first law of motion says an object at rest stays at rest and an object in motion stays in motion with the same speed and same direction unless acted on by an unbalanced force

• This is also called inertia

• Inertia is an objects resistance to change it’s motion

• An object has a constant velocity unless there is an unbalanced force acting on it

• Acceleration requires an unbalanced force

• A force is some type of push or pull

• Some forces are through direct contact of objects

• For example, if I shove a chair, then I come in contact with the chair

• Some forces don’t deal with direct contact

• For example, gravity pulls objects towards the earth’s center even when an object isn’t in contact with the earth

• 1. Is it possible to remove the tablecloth without significantly moving the books lying on it?

• 2. Is it possible to remove the tablecloth without significantly moving the pieces of paper lying on top of it?

• QUESTIONS

• 1. Why don't the books fly off the table when Ms. K.pulls the tablecloth out the first time?

• 2. Explain the difference between Activity 1 (books on the table) and Activity 2 (paper on the table).

• Inertia depends on an object’s mass

• Mass is just how much stuff makes up an object

• If an object has more mass, it takes more to make it change it’s motion

• More mass means more inertia

• If an object has less mass, it takes less to make it change its motion

• Less mass means less inertia