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## 5.6 Chapter summary (ESCMK)

Presentation: 27SC

 Units Quantity Symbol Unit S.I. Units Direction Velocity $$\stackrel{\to }{v}$$ — $$\text{m·s^{-1}}$$ or $$\text{m·s^{-1}}$$ $$\checkmark$$ Force $$\stackrel{\to }{F}$$ — $$\text{kg·m·s^{-2}}$$ or $$\text{N}$$ $$\checkmark$$ Energy E J $$\text{kg·m^{2}·s^{-2}}$$ or $$\text{kg·m^{2}·s^{-2}}$$ — Work W J $$\text{N·m}$$ or $$\text{kg·m^{2}·s^{-2}}$$ — Kinetic Energy $${E}_{K}$$ J $$\text{N·m}$$ or $$\text{kg·m^{2}·s^{-2}}$$ — Potential Energy $${E}_{P}$$ J $$\text{N·m}$$ or $$\text{kg·m^{2}·s^{-2}}$$ — Mechanical Energy U J $$\text{N·m}$$ or $$\text{kg·m^{2}·s^{-2}}$$ — Power P W $$\text{N·m·s^{-1}}$$ or $$\text{kg·m^{2}·s^{-3}}$$ —
• Kinetic energy: $${E}_{k}=\frac{1}{2}m{v}^{2}$$

• Conservation of Energy: Energy is never created nor destroyed, but is only transformed from one form to another.

• Conservation of Mechanical Energy: in the absence of non-conservative forces mechanical energy is conserved.

• When a force acting on an object has a component along the line of motion, work is done.

• Work is the process of transferring energy from object or system to another.

• Energy is the ability to do work.