# General Physics

• General Physics
• Speed and Acceleration
• SPEED = DISTANCE / TIME
• ACCELERATION = CHANGE IN VOLOCITY / TIME
• Speed, distance and time graphs
• Density
• DENSITY= MASS / VOLUME
• Mass and weight
• WEIGHT = MASS X GRAVITY
• Forces
• MOMENT OF A FORCE ON A PIVOT = FORCE X PERPENDICULAR DISTANCE FROM PIVOT
• Hooks Law
• When an elastic object - such as a spring - is stretched, the increased length is called its extension. The extension of an elastic object is directly proportional to the force applied to it:
• FORCE = MASS X ACCELERATION
• Energy
• Transfer
• Energy is converted from one type to another
• General
• Measured in Joules
• Energy can only be transformed from one type to another  never made
• Types of energy
• Chemical
• Electric
• Elastic/ strain
• Kinetic
• KE=MASS X (VOLOITY)2
• Gravitational Potential
• GPE= MASS X GRAVITY X HEIGHT
• GPE= WEIGHT X HEIGHT
• Heat
• Sound
• Light
• Nuclear
• Sources
• Hydroelectric
• Renewable
• Power stations near lakes, reservoirs'
• No CO2 emitted
• Nuclear
• Non-renewable
• Nuclear fission- no CO2 produced
• More energy produced than fossil fuels
• Nuclear waste-Toxic and harmfull
• Neutron hits the nucleus and as the nucleus splitting releases mainly heat energy and as the neutron splits it can travel to hit more nucleus' to create more energy
• Wind energy
• Renewable
• No CO2
• Gas
• Non-renewable
• 370kg/mwh CO2
• Efficiency
• Efficiency% = usefull energy outputx100/ total energy output
• Work and Power
• WORK DONE = FORCE X DISTANCE
• POWER = ENERGY/ TIME
• Pressure
• PRESSURE = FORCE/AREA
• WATER PRESSURE= DENSITY X GRAVITY X HEIGHT

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