PHYS 151Q.005 2-6-2008

# PHYS 151Q.005 2-6-2008 - and change of direction Force is a...

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Day 7 Wed 2/6/2008 PHYS 151Q.005 Chapter 4. Force and Motion Super Mario and his Evil Gun Mario is doing his famous “A-Jump” with velocity (3m/s, 4m/s) at his old fashion 2D world. At the same time, there is an evil gun shooting a shell 30 m in front of Mario. The gun tower is 3m tall, shell speed is 7 m/s, gravity free: but Mario is under the influence of “gravity” (gn=-2m/s^2). Will the shell hit Mario?

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Galileo = a moving object has an intrinsic “quantity of motion” and Needs no Push to keep it moving” Force is the quantity causes “changes” in motion
Changes of motion include starting and stopping, speeding up or slowing down (straight line),

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Unformatted text preview: and change of direction. Force is a vector in Newton. Assume object is small particle with mass m. Net force is the vector sum of all forces acting on the object. Newton’s 1 st Law of motion = An object will stay at rest or continue on a constant velocity (straight line motion) unless it is acted upon by a none zero net force (Rest or constant velocity). Mass= the quantity to measure object’s inertia The standard unit of mass is kilogram Inertial reference frame is the coordinate system which has zero net force Newton’s Second Law – the changes of an objects momentum is equal to the net force acting on it...
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PHYS 151Q.005 2-6-2008 - and change of direction Force is a...

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