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WORK AND POWER - Coggle Diagram

- - - - work done = energy transferred
        
        The amount of work depends on two things:
        
        the size of the force (the greater the force, the more work it does)
        
        the distance moved in the direction of the force (the further it moves, the more work it does)
        
        The term "work" has a specialised meaning in physics, different from its meaning in everyday life.
        
        When physicists think about the idea of "work", they think about forces moving.
- - - - unit of work: joule (J)
        
        One joule (1 J) is the energy tansferred (or the work done) by a force of one newton (1 N) when it moves through a distance of one metre (1 m).
        
        1J = 1N
      - If the direction is not the same, the formula will be W = F x cosθ x displacement or W = Fx s x cosθ
        
        We can have three cases:
        
        θ = 0°, so W = Fs
        
        θ = 90°, so W = 0
        
        θ = 180°, so W = - Fs
- - - - When you lift an object, there are two ways you can increase your power:
        
        lift a heavier object in the same time
        
        lift the object more quickly
- - - - which is equal to P = ΔE/t
        
        unit of power: watt (W)
        
        One watt (1W) is the power when one joule (1J) of work is done in one second (1s).
        
        1W = 1J/s
        
        How to express the efficiency of a light bulb or any other energy-changing device in terms of power
        
        efficiency = (useful power output / power input) x 100%