## Physics from the ground up |

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angle average force average velocity axis ball block center of mass change in kinetic cm/s component compressed conductor CONSERVATION OF MOMENTUM constant acceleration constant speed constant velocity cord Coulomb's law curve cylinder displacement distance Earth elastic collision electric charge electric field electric force electric potential electric potential energy electron energy-conservation principle equal equation equilibrium example EXCHANGE OF MOMENTUM exerts field lines FIGURE force F forces acting frictionless GLANCING COLLISIONS glider gravitational force horizontal inertial frame initial speed initially at rest interaction force interval isolated system kinetic energy loop magnetic field magnetic force molecules momenta momentum change momentum conservation motion negative Newton opposite orbit particle moves particle's perpendicular plane plates positive charge potential energy PROBLEM radius reference frame relative speed rotation SECTION shell shown in Fig SOLUTION spacecraft sphere spring straight line superposition principle surface temperature torque total momentum vector velocity vertical weight wire zero