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lecture7_tth_2101_S11

# lecture7_tth_2101_S11 - PHYS 2101 Spring 2011 I Momentum II...

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PHYS 2101 I. Momentum II. Impulse-Momentum Theorem III. Motion of the Center of Mass IV. Types of Collisions V. Energy & Momentum in Collisions Spring 2011

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A 2000 kg truck traveling north at 40 m/s turns east and accelerates to 50 m/s. (a) What is the net work done on the truck during the turn? What are the (b) magnitude and (c) direction of the change in its momentum? PHYS 2101 EX1: Spring 2011
Objects at rest remain at rest and objects in motion continue to move in a straight line at a constant speed unless their momentum is changed . Newton’s First Law for Momentum Momentum is constant velocity is constant PHYS 2101 Net force changes momentum If net force = 0 momentum is conserved Spring 2011

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For which of the scenarios listed below is momentum conserved? 1 - An object experiencing projectile motion 2 - A ball on the end of a string being swung in circle at a constant speed 3 - A block sliding down a ramp at constant speed 4 - A block sliding down a frictionless ramp 5 - An object at rest PHYS 2101 CT1: Spring 2011
You have the tragic misfortune to be involved in a traffic accident. As your body lurches forward as during the crash, which surface would you prefer for your face to smash into? 1. The hard rubber of the steering wheel 2. The soft squishiness of the air bag PHYS 2101 CT2: Spring 2011

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A ball bounces off a wall without any change in its speed, as shown below. PHYS 2101 CT3: + y + x θ θ (a) Is p x …? 1. Positive 2. Negative 3. Zero (b) Is p y …? 1. Positive 2. Negative 3. Zero ( c ) What is the direction of p ?
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