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