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Newton’s Three Laws

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Newton’s Three Laws

Sir Isaac NewtonScientist and Mathematician

1642 – 1727

He defined the laws of motion and universal gravitation, which he used to predict precisely the motions of stars, and the planets around the sun.

“If I have been able to see further, it was onlybecause I stood on the shoulders of giants.”

—Sir Isaac Newton

- Can you think of some examples?

Soccer

Football

Track

Basketball

- An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law is often called “the law of inertia".

- This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.

- Inertia – is the tendency of an object to resist changes in its velocity: whether in motion or motionless.

Soccer

If I kick a soccer ball towards the net and the goalie is not there to stop it…

GOAL!!!

Bowling

When I roll the bowling ball down the lane, it will keep going until it hits the pins… or the gutter!

- Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).

- Everyone unconsciously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects.

- However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation: FORCE = MASS x ACCELERATION

F = M x A

- If you are a defensive lineman, who would you rather tackle…
A running back that weighs 100 pounds or a running back that weighs 300 pounds?

- For every action there is an equal and opposite re-action.

This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.

- Golf
When Tiger Woods hits the golf ball…what is the reaction?

- Racing
- When Dale Earnhardt steps on the gas pedal, what is the reaction?

- Now that I’ve given you a few examples, I want you to think of one example of each of Newton’s Three Laws of Motion from sports.