Outline PHysics
...90 degrees fut less than 260 degrees • If net work is positive the object speeds up and the net force does work on the object. If the net work is negative the object slows down and work is done by the object on another 5-2 Energy • Kinetic energy depends on speed and mass: directionally proportionate to speed • KE=1/2mv2 • Potential energy is stored energy • It describes an object that has the potential to move because of its position with respect to some other location depends on interaction with the environment • Gravitational potential energy depends on height from a zero level • Gravitational potential energy is the energy associated with an object due to the object’s position relative to a gravitational source • The definition for gravitational potential energy is valid only when the free-fall acceleration is constant over the entire height • Elastic potential energy depends on distance compressed or stretched • Spring constant is the force constant (flexible spring k is small) (stiff spring k is big) • Mechanical Energy (combination of kinetic an potential energy) • The sum of kinetic energy and all forms of potential energy 5-3 Conservation of Energy • Conserved means to remain constant • Ex of conserved quantity is mass • Mechanical energy is often conserved • Adding the kinetic and potential energy gives the total mechanical energy at each position • In the absence of friction the total mechanical energy rema...