Friction is the force opposing motion
It can affect the stopping distance of a car
(Stopping = thinking + braking)
- Thinking can be affected by alcohol, drugs, tiredness etc
- Braking can be affected by road surface, weather, mass of car, speed
Drag force acts on falling objects :
As an object falls through the air, its speed increases. As this is increasing, the drag force acting on it also increases. This happens until the two opposite forces are balanced (both the same size). The object remains at a constant velocity but is still falling
= terminal velocity (this can be shown using sycamore seeds or parachutes)
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