Chapter 4 Physics Notes

# Chapter 4 Physics Notes - CHAPTER FOUR NOTES Physics 195...

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1/5/11 CHAPTER FOUR NOTES Physics 195 Lecture (part one)

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1/5/11 3D KINEMATICS -The position, velocity, and acceleration of a particle in 3 dimensions can be expressed as: r = x i + y j + z k v = vx i + vy j + vz k (i , j , k unit vectors ) a = ax i + ay j + az k -We have already seen the 1-D kinematics equations:
1/5/11 3D KINEMATICS For 3-D, we simply apply the 1-D equations to each of the component equations. Which can be combined into the vector equations:

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1/5/11 2D KINEMATICS Often 3-D problems can be reduced to 2-D problems : -Choose y axis to be along direction of acceleration 1Choose x axis to be along the “other” direction of motion - Example : Throwing a baseball (neglecting air resistance). 1Acceleration is constant (gravity). 1Choose y axis up: ay = -g
1/5/11 RAILROAD CAR A flatbed railroad car is moving along a track at constant velocity. A passenger at the center of the car throws a ball straight up. Neglecting air resistance, where will the ball land? 1. Forward of the center of the car 2. At the center of the car 3. Backward of the center of the car

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1/5/11 KINEMATICS IN TWO DIMENSIONS x and y motions are independent! They share a common time t
1/5/11 SPECIAL CASE: Projectile Motion

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1/5/11 QUESTION #1 Without air resistance, an object dropped from a plane flying at constant speed in a straight line will 1. Quickly lag behind the plane. 2. Remain vertically under the plane. 3. Move ahead of the plane
1/5/11 QUESTION #2 You are a vet trying to shoot a tranquilizer dart into a monkey hanging from a branch in a distant tree. You know that the monkey is very nervous, and will let go of the branch and start to fall as soon as your gun goes off. On the other hand, you also know that the

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## This note was uploaded on 01/04/2011 for the course PHYS 195 taught by Professor Anderson during the Fall '07 term at San Diego State.

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Chapter 4 Physics Notes - CHAPTER FOUR NOTES Physics 195...

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