Information about Newtons Laws of Motion

Newtons Laws of Motion

1st Law of Motion O An object at rest will stay at rest and an object in motion will stay in motion (in the same direction and at a constant speed) UNLESS an unbalanced force is applied.

1st Law of Motion

Examples O Can you explain these using the 1st Law of Motion?

1st Law O More simply stated: O If an object is moving, they want to stay moving. O If an object is still, they want to stay still. O The only way to change what they an object is doing is to apply a force.

Law of Inertia O Objects are lazy – they do not want to stop what they are doing. O What can we call this “laziness?” Inertia O Inertia is a measure of it’s resistance to change. O The more resistant, the more inertia O Newtons’ First Law is also called the

2nd Law of Motion O Usually stated as an equation: F = ma O What does this mean? O And don’t say force equals mass times acceleration. Anyone can say that, but do you really understand what it means? O What if I restated the equation?

Newton’s 2nd Law Explained O It means the acceleration of an object depends on two things – the mass of the object and the amount of force you apply to change its motion. O Let’s look at this relationship.

Let’s Look Mathematically O If I double the numerator, what happens? = 4 = 8 4 4 O When one variable increases, another variable increases the same amount. O This is called a direct proportion O Which 2 variables are directly proportional? O What does that mean? But this is science class!

Math and Science O What happens when I increase the denominator? O Let’s try! O4 = 4 = O4 8 O This is called an indirect proportion, or inverse proportion O Which 2 variables are inversely proportional? O What does that mean?

Newton’s 2nd Law O Look at the equation. Think of the previous fractions. Can you explain what it means now?

2nd Law of Motion O The greater the applied force, the faster the object will move (acceleration). O The more mass an object has, the more force you need to change it’s motion

3rd Law of Motion O For every action, there is an equal and opposite action.

Let’s Review Newton O Once moving at a steady speed In a straight line It will continue moving At a steady speed In a straight line O Once standing still It will stay still

Newton O It accelerates in the direction that you push it If you push twice as hard, it accelerates twice as much O If it has twice the mass It accelerates half as much

Newton O If you push on it It pushes on you

Check out these videos Ohttp://science.discovery.com/inte ractives/literacy/newton/newton. html Ohttp://www.fmalive.com/

Questions?

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