Concept: For every action, there's an equal and opposite reaction.

Rotational Version: The action torque and reaction torque are equal and opposite. If object A torques object B, object B torques object A back, equally and oppositely.

🎡 Real-world Example: When you try to wring out a wet cloth, your left hand twists one way while your right hand twists the opposite way.

Formula for work W

• W = τ × θ where τ is torque and θ is angular displacement.

Power P = × τ × ω

Kinetic energy for linear motion: =E_k​=\(\frac 12\)​mv²

Rotational KE: Ek​=\(\frac 12\)​Iω2 where I is the moment of inertia and ω is the angular velocity.

🚲 Real-world Example: Think of a bike wheel spinning. Faster it spins, more energy it has!