Physics

Physics

1. Newtons 3rd law

   • For every action there is a equal an opposite reaction
   • There is a force pushing down on the ground sending a rocket up

2. Forces between objects

   • A force can change the shape of an object
   • A boxer who punches a opponent with a force of 100n experiences a reverse force of 100n from his opponent.

3. Circuits

   • A fuse is a safety device that switches off an appliance if a current flowing through the live wire gets too big
     • A fuse has a rating in amps printed on the side
       • If the current flowing through a fuse goes above its rated value then the fuse blows
         • This breaks the circuit and disconnects the appliance

4. Doppler effect

   • When a fire engine drives past its siren is high pitched as it comes towards you and low pitch as it drives away - this is the doppler effect
   • Frequency decreases as it gets further away

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