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Chapter 6 Newton’s Laws

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**Sir Isaac Newton December 25, 1642 - March 20 1727**

key figure in scientific revolution ideas considered beginning of modern science described planetary motion, theory of color, law of cooling, studied speed of sound. Made many discoveries in Calculus wikipedia

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**Newton’s First Law of Motion**

The law of inertia

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**Newton’s first law of motion**

“An object at rest will stay at rest and an object in motion will stay in motion with the same velocity unless acted on by an unbalanced force” REPEAT IT!

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**Newton’s first law of motion**

“An object at rest will stay at rest and an object in motion will stay in motion with the same velocity unless acted on by an unbalanced force” WRITE IT!

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**Newton’s first law of motion**

“An object at rest will stay at rest and an object in motion will stay in motion with the same velocity unless acted on by an unbalanced force” tell a friend

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**Newton’s first law of motion**

Example: Explain what that means for egg sitting in a carton. (try telling an egg to move) Example: Explain what that means for a car moving at a constant speed.

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**Newton’s first law of motion**

Unbalanced Force - forces that result in a net force on an object and can cause changes in motion. REPEAT IT!

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**Newton’s first law of motion**

Unbalanced Force - forces that result in a net force on an object and can cause changes in motion. WRITE IT!

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**Newton’s first law of motion**

Unbalanced Force - forces that result in a net force on an object and can cause changes in motion. TELL A FRIEND ABOUT IT!

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**Newton’s first law of motion**

Example: eggs spinning. - Prediction: What should happen if I spin the egg on this table?

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**Newton’s first law of motion**

Example: eggs spinning. - Prediction: Are the forces acting on the egg balanced? - Time the length of time a hard boiled egg spins and a raw egg spins.

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**Newton’s first law of motion**

Inertia - The property of an object that resists change in its motion. Repeat it!

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**Newton’s first law of motion**

Inertia - The property of an object that resists change in its motion. WRITE IT!

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**Newton’s first law of motion**

Inertia - The property of an object that resists change in its motion. TELL IT TO A FRIEND

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**Newton’s first law of motion**

Inertia - The property of an object that resists change in its motion. - “Inertia is a property of matter.” <- where have you heard that before?

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**Newton’s first law of motion**

Inertia: Example: Stopping a spinning raw egg vs stopping a spinning boiled egg. What is the unbalanced force acting on the egg?

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**Newton’s first law of motion**

Inertia: Example: What will if we pull a card out from underneath a coin? Why? Draw a free body diagram for the coin.

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**Newton’s first law of motion**

Inertia: Example: What will happen if we push the car with goofy standing on it? Why? Draw a free body diagram for the goof.

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**Newton’s first law of motion**

Inertia: Example: What will happen if we push the car with goofy standing on it, with a “seat” to hold him in place, and the object crashes into a wall? Why? Draw a free body diagram for the goof.

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**Newton’s first law of motion**

Inertia: Example: In light of goofy’s crash why is it important that you wear a seatbelt?

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**Newton’s first law of motion**

Why is a stack of many books harder to push than a single book?

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**Newton’s first law of motion**

Why is a stack of many books harder to push than a single book? - YES FRICTION! but is that it?

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**Newton’s first law of motion**

Imagine trying to push a bowling ball compared to pushing a soccer ball. The soccer ball will be easier to move. Just because of friction?

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**Newton’s first law of motion**

Imagine trying to punt a bowling ball compared to punting a soccer ball. The soccer ball will be easier to punt. That has nothing to do with friction.

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**Newton’s first law of motion**

INERTIA depends on MASS - the larger the mass, the harder it is to change an objects motion.

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**Newton’s first law of motion**

INERTIA depends on MASS - the larger the mass, the harder it is to change an objects motion. Repeat it!

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**Newton’s first law of motion**

INERTIA depends on MASS - the larger the mass, the harder it is to change an objects motion. WRITE IT!

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**Newton’s first law of motion**

INERTIA depends on MASS - the larger the mass, the harder it is to change an objects motion. Tell it to a friend.

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**Newton’s Second Law of Motion**

Force = mass x acceleration

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**NEWTON’S SECOND LAW Second law states:**

Acceleration is Force divided by Mass REPEAT IT!

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**NEWTON’S SECOND LAW Second law states:**

Acceleration is Force divided by Mass WRITE IT!

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**NEWTON’S SECOND LAW Three main Ideas:**

1. Acceleration is the result of unbalanced forces (ie. if there’s a net force there is acceleration) 2. A larger force makes a proportionally larger acceleration. 3. Acceleration is inversely proportional to mass.

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**NEWTON’S SECOND LAW Three main Ideas:**

2. A larger force makes a proportionally larger acceleration. compare a rocket powered car to a go cart.

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**NEWTON’S SECOND LAW Three main Ideas:**

3. Acceleration is inversely proportional to mass. Explain why your shopping cart will go slower and be harder to push if it contains one hundred 1 kg books, compared to one containing a single 1 kg book. Explain why I’m okay with heading a soccer ball but not a medicine ball.

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**Newton’s third Law of Motion**

action/reaction

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Newton’s Third Law For every action force there is reaction force that is equal in strength and opposite in direction.

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Newton’s Third Law What would happen if I jumped up and landed on the earth. Did I put more force on the earth or did the earth place more force on me?

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Newton’s Third Law

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Newton’s Third Law

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**momentum - the mass of an object times its velocity**

P = m*v

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conservation of momentum - as long as interacting objects are not influenced by outside forces, the total amount of momentum is conserved.

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conservation of momentum - as long as interacting objects are not influenced by outside forces, the total amount of momentum is conserved.

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**http://www.youtube.com/watch?v=denlqdQv6 OA**

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1.4 Forces change motion.

1.4 Forces change motion.

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