1. Relative Motion, Atwood’s Machine & Inclined Planes
Dynamics Extension – Part II
Relative Motion, Atwood’s Machine & Inclined Planes
Physics 12

2. Learning Outcome (Student will…):
 use vector analysis in two dimensions for systems involving two or more masses, relative motions, static equilibrium, and static torques

3. How do we analyze motion in two different reference frames?
Relative Motion
Definition: Reference Frame – a coordinate system in which an experimenter makes position and time measurements of physical events
Definition: Inertial Reference Frame – that in which the Laws of Motion apply (not accelerating)
How do we analyze motion in two different reference frames?

7. Atwood’s Machine (simple)

8. Example of Modified Atwood’s Machine
A 15 kg cart is attached to a hanging 25 kg mass. Friction is negligible. What is the acceleration of the 15 kg cart?

9. Inclined Planes

11. What is the acceleration of the system
What is the acceleration of the system? What is the tension developed in the connector?