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If object A exerts a force on object B then object B exerts a force on object that is in the opposite direction, equal in magnitude, and of the same type. Recall that a force is an interaction between two objects.An object that is at rest will remain at rest and an object that is moving will continue to move in a straight line with constant speed, if and only if the sum of the forces acting on that object is zero.Objects only know what is acting directly on them right now Objects are dumb - They have no memory of the past and cannot predict the future.Work Done by Force at an Angle to Displacement Slide 10-29 Slide 10-20Įnergy Transfers: Work W K W Eth W Us Slide 10-21 Work is the mechanical transfer of energy to or from a system via pushes and pulls. Some Energy Transformations Echem Ug KEth Us KUg Echem Ug Slide 10-15Įnergy Transfers These change the energy of the system.

Energy can be transformed within the system without loss. Acceleration Applying Newton’s 2nd Law Apparent Weight Brainstorm: What do we know about friction? Wednesday’s Class: All about Forces & frictionįorms of Energy Mechanical Energy Thermal Energy Other forms include Slide 10-12Įnergy Transformations Kinetic energy K = energy of motion Potential energy U = energy of position Thermal energy Eth = energy associated with temperature System energy E = K + U + Eth + Echem +. Physics 151 Week 9 Day 1 Topics: Work, Energy, & Newton’s 2nd Law Energy and Work Force and Motion Graphs Questions from last time Net force vs.