Mechanics 1

Mechanics 1 - Mechanics 1 Motion of bodies Kinematics...

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Unformatted text preview: Mechanics 1 Motion of bodies Kinematics description of the motion in terms of position, velocity and acceleration Mechanics description of the motion in terms of physical laws, Newton’s laws position as a function of time (for v=constant) If a car is going 60 mph East, how long does it take to travel 1 mile East? What is velocity? Velocity: *Units in English system (miles, hours) Moving in the opposite direction Speed: the magnitude of the velocity - scalar Velocity: both magnitude AND direction of the motion - vector Going east: velocity + Going west: velocity - You run 400m around the track at Drake Stadium with a speed of 4m/sec. After one lap, what is your - average speed? - average velocity? Newton’s First Law: In the absence of a net external force, objects move at constant velocity. You may recognize this law as: “Objects at rest tend to stay at rest. Objects in motion tend to stay in motion.” Not moving at all can be considered moving with a constant velocity equal to zero. An object may have several forces acting on it It is the net force which must be zero. Force due to gravity Force from the spring 0 Net Force The velocity of the platform is constant, so the sum of all the forces acting on it must be zero....
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Mechanics 1 - Mechanics 1 Motion of bodies Kinematics...

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