1. Aim: How does Newton’s second law apply with pulleys?
Do Now: Quiz
HW: Problem Set

2. 4 Steps for 2nd Law Problems
Draw a Free Body Diagram
Write that the “Up Force = Down Force” & “Left Force = Right Force”
Write Newton’s Second Law in all directions
Solve for Unknown
Draw free body diagram from last demo
F1 is force of person on block, F2 is force of person on block

3. Frictionless vs. Friction
m 20m 30o Incline Two identical blocks of mass 10 kg travel down a ramp. Ramp 1 is frictionless and ramp 2 has μ = Which block experiences the greatest acceleration? Explain quantitatively. What is the acceleration and time it takes traveling?

4. Pulleys, Tension and Newton’s Law
5 kg - A μK = kg – B
Adjust to an actual block in class?
Will the system's acceleration be greater, less than or the same as gravity? Explain.
Find the systems acceleration.

5. Atwood’s Machine Challenge
Ah, the classic elevator pulley system… Draw a FB diagram and derive an expression for “a” without FT in the final equation. WORK TOGETHER!