Understanding Newton's Laws of Motion
Newton's Laws of Motion explain how forces interact with objects, involving concepts like inertia, mass, acceleration, and action-reaction pairs. Examples of forces include tension, weight, and reaction force, with the total force being the vector sum of all applied forces. Through detailed problems involving scenarios like Spiderman stopping a train and the Apollo mission to the Moon, these laws are applied to real-life situations.
Uploaded on Oct 04, 2024 | 0 Views
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
Newtons Laws = = st 1 Law (Same Galileo' as Law s of Inertia) : 0 F v const force. a by acted unless elocity, constant v with moves object An = nd 2 Law : F m a Force is equal Mass to times Accelerati on = rd 3 Law : F F B A A B Force of opposite and equal is action force to of counter - action. Unit of force called is Newton m (N) kg = 1 1 N 2 s
Examples of Forces N (Reaction force) T (Tension) = W m g (Gravitational force , or Weight) Forces a vectors! The total force is the vector sum of all applied forces: + = ( T F F F y x total = = , ) , ( x y + Ftotal N T W ) N mg
Homework 9 Problem 1. In the movie Spiderman 2, Peter Parker aka Spiderman manages to stop the train by using his web. (search youtube for Peter Stops The Train! clip).It takes t=45s of screen time. The initial speed of the train is approximately v=80 km/hr. Find the average acceleration of the train, and the force that Spiderman can hold. This force is of strategic importance for any villain: you can see from the video that the superhero is close to his limit. Mass of the NYC subway train (full of people) is 300,000kg. How this force approximately compares to Spiderman s weight?
Problem 2. The Apollo mission to Moon was lunched by a very powerful rocket called Saturn V. The total mass of the rocket right before launch was M=2.8x106 kg. Total thrust (propulsion force) of 5 engines of the first stage is F=34x106 N (Newtons). The rockets is launched vertically upward. a) Find the total force acting on the rocket and acceleration of the rocket right after the launch. Neglect air resistance. b) Similarly to part (a), find acceleration right before the fuel of the first stage is fully burned. The mass of the fuel is m=2.1x106 kg
