Friction slows things down. If an object has no force, it will always slow doen and stop due to friction.
Friction acts in the opposite direction to movement. When 2 surfaces are in contact with each other or when an object passes through a fluid, is friction.
To travel at a steady speed, the driving force needs to balance the frictional force.
Resistance / Drah from fluids: most resistive forces are caused by air resistance or drag. To reduce the amount of air resistance or drag there is on an object, the shape of the object needs to be streamlined.
Drag increases as the speed increases: frictional forces from fluids increases with speed. A car has more friction to work against when travelling at a faster speed, this causes it to be harder to maintain a steady speed.
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