Energy Pie Charts

Constant Velocity Motion The Toy Car Lab Constant Velocity Motion

Example 2 Toy Car Lab 1 2 3 Is the system isolated? Yes, there are no external forces! System = Toy Car, Table, Earth System = Toy Car, Table System = System = Toy Car Since the system is isolated, energy is conserved. 1 2 3

The Ball Rolling Down an Incline Lab Uniformly Accelerated Motion

Example 2 Ball Rolling Down an Incline System = Ball, Incline System = Ball, Incline, Earth System = System = Ball 1 Friction = No Friction = ? 2 3 Is the system isolated? 4 Yes, there are no external forces!

Example 2 Ball Rolling Down an Incline System = Ball System = Ball, Earth, Incline System = System = Ball, Earth 1 Friction = No Friction = ? 2 3 Since the system is isolated, energy is conserved. 4 1 2 3 4

The Pendulum Lab

Example 3 The Pendulum Lab 1 5 How can we tell from the diagram if energy is dissipated? 2 4 Position 5 is lower than position 1! 3 System = Pendulum Bob, String, Clamp, Earth System = System = Pendulum Bob System = Pendulum Bob, String, Clamp System = Pendulum Bob, String

Example 3 The Pendulum Lab 1 5 Is the system isolated? Yes, there are no external forces! 2 4 3 Since the system is isolated, energy is conserved. System = Pendulum Bob, String, Clamp, Earth 1 2 3 4 5

Example 3 The Pendulum Lab 1 5 2 4 3 System = Pendulum Bob, String, Clamp, Earth 1 2 3 4 5