Download presentation
Presentation is loading. Please wait.
Published bySheena Ryan Modified over 9 years ago
1
Newton’s Laws of Motion - 1
2
Describes the relationship between the motion of objects in our everyday world and the forces acting on them. Conditions when Classical Mechanics does not apply: - Very small objects (< atomic sizes) - Objects moving near the speed of light Classical Mechanics
3
Forces Simple definition: a force is a push or pull on some object. Force is a vector quantity.
4
Distunguish: contact forces and remote (“action at a distance” or “field” forces. Contact forces result from physical contact between two objects. Field forces act between disconnected objects.
5
Examples of Contact and Field Forces
6
The Four Fundamental Forces In order of decreasing strength: Strong nuclear force Electromagnetic force Weak nuclear force Gravity All are field forces. Only gravity and electromagnetic forces are treated in classical mechanics.
7
Lex 1: Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare. Law 1: Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
8
This is sometimes called the law of inertia.
9
Lex II: Mutationem motus proportionalem esse vi motrici impressae, et fieri secundum lineam rectam qua vis illa imprimitur. The acceleration produced by a particular force acting on a body is directly proportional to the magnitude of the force and inversely proportional to the mass of the body.
10
Lex II: Mutationem motus proportionalem esse vi motrici impressae, et fieri secundum lineam rectam qua vis illa imprimitur. The acceleration produced by a particular force acting on a body is directly proportional to the magnitude of the force and inversely proportional to the mass of the body.
11
Second Law: 1. The acceleration vector is in the direction of the net force. 1.
12
Second Law: 2. The magnitude of the acceleration vector is proportional to the magnitude of the net force. 2.
13
Second Law: 3. The magnitude of the acceleration vector is inversely proportional to the mass. 3.
14
The SI unit for force: The force that gives an object of 1 kg mass an acceleration of 1 m/s 2 is defined as 1 newton (N). 1 N = 1 kg. m/s 2
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.