Chapter04

# Chapter04 - Chapter 4 Motion with a Changing Velocity 1...

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Chapter 4: Motion with a  Changing Velocity

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1. Motion along a line due to a  constant net force If the net force is not zero, an object will accelerate. The acceleration of the object is constant, meaning constant in magnitude and in direction. Thus, from Newton’s 2nd law, what you will find is an acceleration. Why is the acceleration so important? - Because from the acceleration we can predict the motion of particle, what will be the velocity and where will be the object.
Equations for constant acceleration motion - You should have this in your formula sheet. 0 ( ) x x x v t v a t = + 2 0 0 1 ( ) 2 x x x t x v t a t = + + 2 2 0 0 2 ( ) x x x v v a x x = + - 0 0 2 x x v v x x t + - =

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Example 4.1) A brick of mass m 1 =3.0 kg rests on a frictionless horizontal surface. A second block of mass m 2 =2.0 kg hangs from a cord. The block are released from rest. (a) Find the accelerations of the two blocks after they are released. (b) What is the velocity of the first block 1.2 s after the release of the blocks? (c) How far has block 1 moved during the 1.2-s interval?
Example 4.3) A motorboat starts from rest at a dock and heads due east with a constant acceleration of magnitude 2.8 m/s

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