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# Chapter 9: Application of forces and transfer of energy ## Calculating Pressure Pressure = Force / Area $P = F / A$ * SI unit: Pascal * 1 Pascal: 1 N/m2 * Pressure is force acting perpendicularly to area exerted on surface ## Types of Force * Contact force * applied on touching...

# Chapter 9: Application of forces and transfer of energy ## Calculating Pressure Pressure = Force / Area $P = F / A$ * SI unit: Pascal * 1 Pascal: 1 N/m2 * Pressure is force acting perpendicularly to area exerted on surface ## Types of Force * Contact force * applied on touching * Examples * Frictional * Tension * Air resistance * Non-contact force * force acts on object * Examples * gravitational force * Magnetic force * Electrostatic force ## Sources of energy * Thermal (Heat) energy * light energy * sound energy * Chemical potential energy * Nuclear potential energy * Gravitational potential energy * Kinetic energy ## Energy conservation * Energy SI unit --joule (J) * Energy 1. Electrical energy 2. Sound energy 3. Kinetic energy 4. Chemical potential energy 5. Gravitational potential energy 6. Kinetic Energy ## Transformation of energy It is work done where force applied causes object to move in the same direction as the force applied on it. * force applied on the object * distance travelled by the object * the right angle in the same direction as the force applied on it ## How do forces of nature effect? * Earthquake * shockwave * Causes building to collapse * Wave generated is P(longitudinal) * S(transverse) wave travelling through mantle * Tsunami * Seismic Sea Wave ## Weight vs Mass | | Weight | Mass | | :----- | :---------------------------- | :---------------------------- | | **What?** | measure of gravitational force | amount matter in the object | | **How does it change?** | changes | remains the same | | **SI Unit?** | Newton(N) | Kilogram (Kg) | | **What can be used to calculate it?** | $W = mg$ | |