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Chapter 5 – Force and Motion I - Physics Main

S first Newton s second Particular forces:-Gravitational- Weight-Normal -Friction- TensionIV. Newton s third 5 Force and Motion II. Newton s first law: If no net forceacts on a body, then the body s velocitycannot change; the body cannot accelerate v = constant in magnitude and Principle of superposition:when two or more forces act on a body, the netforce can be obtained by adding the individual forces mechanics laws cannot be applied when:1) The speed of the interacting bodies are a fraction of the speed oflight Einstein s special theory of ) The interacting bodies are on the scale of the atomic structure Quantum mechanics- Inertial reference frame: where Newton s laws Newton s second law: The net Force on a body is equal to the product of the body s mass and its acceleration.

(a) Acceleration of the blocks. (b) Tension of the cord. Adding a a m s T N Block T f F m a T a Block m g T ma T a f N m g N N F m g N F m g N g x k k g y g x 3 1.26 0.42 / , 9.38 2: 1.84 6.7 2 1: 9.8 cos20 1.84 cos20 18.42 sin20 6.7 2 2 , 2 1 1 2 2 2 2 , 2 2 , 2 T N m 1 m 2

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Transcription of Chapter 5 – Force and Motion I - Physics Main

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