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Thursday 1-30-14

Thursday 1-30-14. WU: What is the average speed between 1 & 3 minutes? . S = D D D t. S = 300 m - 150 m 3 min - 1 min . S = 150 m 2 min . S = 75 m min. PreAP Balloon Car Project . Major Grade

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Thursday 1-30-14

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  1. Thursday 1-30-14 • WU: What is the average speed between 1 & 3 minutes? S = DD Dt S = 300 m - 150 m 3 min - 1 min S = 150 m 2 min S = 75 m min

  2. PreAP Balloon Car Project Major Grade • Race day (when to bring your completed car):___Tuesday 2-18______ • Lab write up due: _Friday 2-21_______

  3. Rules: • You must research and construct your car individually at home. If you have questions be sure to attend tutorials. • The car can be powered by 1 or 2 balloons. 2 Balloons is not always better. • You can build the car base out of anything. • It must have at least 3 wheels. Wheels are defined as anything round that goes around. They can NOT be from a toy car. They must be made from something that was not originally meant to be used as wheels. • The car may not leave the ground at any time during the race and must move on its wheels – not slide. • Do not take your car apart after you race. We will display them around the room and vote for the best looking car.

  4. Thursday 1-30-14 • Grade labs from yesterday • Update ISN • Newton’s Laws • HW: Which Law is it? Worksheet

  5. Newton’s Laws Of Motion But returned to do his famous experiments when the plague shut down the school. Sir Isaac Newton was born in this farmhouse on January 4, 1643. He was born premature and was not expected to live. He left for Cambridge University when he was 19.

  6. Isaac Newton You’ll thank me for that one in high school or college. Isaac Newton is regarded by most as the greatest figure in the history of science. Among his many distinctions, he is credited with… …the universal theory of gravity… …the invention of the reflecting telescope.. …the invention of calculus… …the discovery of the spectrum of colors… …and the first theories of the speed of sound and the origins of stars.

  7. Isaac Newton However, he is most famous for developing the three laws of motion. On July 5, 1687, he published Philosophiae Naturalis Principia Mathematica. In this groundbreaking book, he laid out the laws that all objects must obey when dealing with gravity and motion. Don’t be afraid, there are only three to remember!

  8. Newton’s First Law (Law of inertia) Newton’s first law states: An object at rest stays at rest and an object in motion stays in motion until acted upon by another force. Basically, objects keep on doing what they’re doing unless some kind of force interrupts. Also known as the Law of Inertia. Inertia is the reluctance of an object to change its state of motion. Basically, “inert” means stubborn and unchanging. Need proof? This is why a seat belt saves your life in a car crash.

  9. Newton’s 1st law With no seat belt the person in motion will stay in motion, even when the car stops! With a seat belt the person in motion will stop along with the car they are attached to!

  10. Newton’s Second Law (Law of acceleration) Newton’s second law states: The acceleration of an object depends on the mass of the object and the amount of force applied to the object. Basically, the larger an object is, the more force required to move it and the slower it will accelerate . Need proof? Pushing your friend in a toy tractor is easy. Pushing your friend’s pet elephant? Not so easy, is it? Why?

  11. Newton’s Third Law (Action/Reaction) Newton’s third law states: For every action, there is an equal and opposite reaction. Basically, forces come in pairs. Wherever there is one force there is always another. The result always comes down to mass. Need proof? If you move the paddle from front to back, the canoe moves forwards Because while the paddle is pushing on the water, the water is pushing back on the paddle.

  12. Balanced Forces Opposite forces are equal so no change in motion will occur Unbalanced Forces Opposite forces are not equal. The larger force will cause movement in it’s direction

  13. 950 N 950N 950 N 800N Balanced or Unbalanced Forces Will there be any motion in the first example? Will there be any motion in the second example? Which direction will it move? What will the net force be? 150 N to the left

  14. Gravity Floor Balanced or Unbalanced Forces What size force would be needed to move to the right? What size force would be needed to move to the left? Anything less than 25 N Anything greater than 25 N 25N  ? N What other forces are pulling or pushing this envelope? How does the force of gravity and the floor compare? Equal and opposite. (No motion vertically.)

  15. Newton’s Cradle How does this demonstrate forces? Law of conservation of momentum (If 1 ball is released, then 1 ball bounces off)

  16. More on Newton’s Second Law The acceleration of an object depends on the mass of the object and the amount of force applied to the object. Force = Mass X Acceleration Or, if you want to shorten it… Let’s check out that second one again… F=ma This can be summed up in an easy equation.

  17. Newton’s Second Law What force is needed to move this car with an acceleration of .05 m/s2? Force = 1,000 kg x .05 m/s2 = 50 kg m/s2 or 50 N

  18. Newton’s Second Law When you smack a tennis ball as hard as you can with a tennis racket, the ball flies far and fast. Try using that same racket with the same force but with a baseball instead. What’s going to happen? The ball doesn’t go as far or as fast and you’re lucky if your racket doesn’t end up looking like this guy’s. Why? Ready For more about the second law? As the mass of the ball goes up, your force better go up, too, or the ball is not going to accelerate as fast.

  19. Newton’s Second Law Let’s say crazy old Mike Tyson gives you a pat on the head because he’s proud of you for getting an A on your science test. Now let’s say crazy old Mike Tyson pounds on your face as hard as he can because…well, because he’s crazy like that. I’m so proud of you. That’s the effect of different masses. How about the effect of different forces? The more force =‘s more acceleration Want to take a wild guess which one is going to send you flying into the next county? And we haven’t even stopped to count your ears yet.

  20. Newton’s Second Law The larger the mass, the slower the motion. The smaller the mass, the faster the motion. The larger the force, the faster the motion. The smaller the force, the slower the motion. So let’s sum up that second law. The smaller the force, the slower the motion and vice versa. Smaller equals quicker.

  21. Thursday 1-30-14 • HW: Which Law is it? Worksheet • STAAR Diagnostic Tomorrow & Monday • Force Problems to do after Practice Test

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