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Newton's Laws - Coggle Diagram
Newton's Laws
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When there is a car crash the car's contents and its passengers decelerates rapidly, however features such as seat belt, air bags and crumple zones, increase the time taken for the change in speed of the occupants, which reduces deceleration and reduces injury
Air bags - increase the time taken for the motion of the a car occupant's head to decelerate from maximum speed to zero
Crumple zones - areas of a vehicle that are designed to crush in a controlled way in a collision, so like an air bag it reduces the force exerted on a passenger
Seat belt - car crashes and there is no unbalanced force acting upon a person so they continue forward. The person exerts a force on the seat belt so the seat belt exerts an equal and opposite force on the person
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Unchanging motion is at rest or when the object is moving at a steady speed in a straight line - balanced forces
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An object will remain at rest or at a constant speed if the forces are balanced, unless there is an unbalanced force which means that the object is accelerating
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When friction acts between surfaces, some kinetic energy is transformed into heat energy
Energy is lost or not used effectively when friction occurs. For example, a bike using its brakes slows down, and the kinetic energy of the bike is transferred into heat energy in the brakes
How much energy is lost depends on the frictional force and the distance over which the frictional force is acting
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For example, a rocket exerts a force on the gases downwards and so the gases exert a force on the rocket upwards
If A exerts a force on B, then B exerts and equal but opposite force on A
The bigger the body, the bigger the gravitational field, .e.g Jupiter has a larger gravitational field than Earth
After jumping out of a plane the skydiver begins to accelerate downwards at 9.8ms-^2, however as the skydiver's speed increases the frictional force due to air resistance also increases
There comes a point where the skydiver's upward frictional force equals to skydiver's downward weight
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