G4 - What is Force ? Accordig to Webster, FORCE means many...

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Unformatted text preview: What is Force ? Accordig to Webster, FORCE means many things: strength or energy exerted or brought to bear cause of motion or change active power capacity to persuade or convince legal efficacy (. . . a law still in force. . . ) military strength, etc., etc. In Physics, FORCE is that agent which accelerates a mass and/or deforms an object (e.g., a spring) c circlecopyrt L.Frommhold . p.24/24 What is Force ? Pull hard enough: acceleration of mass (force of agent; tension of string) Spring stretches (deformation) (convenient measurement of force !) c circlecopyrt L.Frommhold . p.23/24 Examples of Force Gravity (accelerates a falling object) Impulse force (racket on tennis ball) Friction (decelerates a moving mass) Electric and magnetic forces, etc. Note that force is a vector c circlecopyrt L.Frommhold . p.22/24 Newtons First Law Every object continues in a state of rest, or of uniform velocity in a straight line, as long as no net force acts on it. Net force (definition): vector F net = vector F 1 + vector F 2 + c circlecopyrt L.Frommhold . p.21/24 About Newtons First Law A puck on (ideal) ice, once in motion, continues with constant speed forever. A schoolbus comes to a sudden stop, and all the backpacks on the floor start to slide forward. Why? c circlecopyrt L.Frommhold . p.20/24 Inertial Frames of Reference Frames of reference may be attached to a moving vehicle and thus are moving relative to an observer...
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G4 - What is Force ? Accordig to Webster, FORCE means many...

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