Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Physics 10 Newton’s 2nd Law Slide 1 Slide 2 Slide 3 A rocket becomes progressively easier to accelerate as it travels through space. Why is this so? (Hint: About 90% of the mass of a newly launched rocket is fuel.) ⇒ From Newton’s 2nd law, a = Fnet/m. As fuel is burned, the mass of the rocket becomes less. As the mass decreases, the acceleration increases. On a long alley, a bowling ball slows down as it rolls. Is any horizontal force acting on the ball? How do you know? ⇒ Yes, if the ball slows down, then a (net) force must be causing the acceleration. The force is probably air resistance and friction between the ball and alley. A common saying goes, “It’s not the fall that hurts you; it’s the sudden stop.” Translate this into Newton’s laws of motion. ⇒ When you stop suddenly, your velocity changes rapidly, which means a large acceleration. By Newton’s second law, this means the force that acts on you is also large. Experiencing a large force is what hurts you. 1