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Physics Revision Collisions and Explosions * Momentum has size and direction * When 2 objects are at rest, their momentum is zero * When 2 objects push each other apart, they move apart with equal and opposite momentum Changing Momentum * * The more time an impact takes, the less the force exerted * This is used in cars. Crumple zones and air bags slow down the collision and therefore reduce the forces Electrical Charges * + + + - Repel * + + - - Attract * - + - - Repel * Insulating materials that lose electrons when rubbed become positively charged * Insulating Materials that gain electrons when rubbed become negatively charged. * Electrons have Negative forces Charge on the Move * Electric current is the rate of flow charge. * A metal object can only hold charge if it is isolated from the ground * A metal object is earthed by connecting it to the ground * Metals - good conductors because they contain free,...

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