![]() ![]() These different safety features decrease the rate of change of momentum, which decreases the force of the collision on any people within the car. Visit our Physics GCSE Hub to learn everything there is to know about our year-round revision courses and how they can help you get the mark you deserve. Discover curriculum-aligned study sets and learning activities for the exam board specifications below. ![]() ![]() Crumple zones refer to the areas of a car that are designed to deform or crumple on impact. Half life - Radioactive decay - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize GCSE AQA Radioactive decay With the wrong number of neutrons, nuclei can fall apart. Use Quizlet for GCSE Physics revision to learn about everything from electricity to motion and forces. Car safety features such as seatbelts, airbags and crumple zones all work to change the shape of the car, which increases the time taken for the collision. The force of the collision is equal to the rate of change of momentum. Car safety featuresĭuring a collision there is a change in momentum. Momentum is a vector and they are in opposite directions so add up to zero. These extra bits of momentum add nothing to the whole system. So in a collision the two objects each gain the same momentum but in opposite directions. The change in momentum is given by the force multiplied by the time it acts for. This means that the objects will each have the same size force acting for the same amount of time. When objects collide, they will exert equal and opposite forces on each other all the time they are in contact. The equation shows that the force involved is equal to the rate of change of momentum. The rate at which energy is transferred is called power and the amount of energy that is usefully transferred is called efficiency. time taken ( t ) is measured in seconds (s) Energy is a key principle in physics, as it allows work to be done. ![]()
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