A car is driving on a level road and has a force of 1000 N acting on it to the right. The road has friction acting on the car with a force of 200 N to the left. The car's engine is providing a force of 800 N to the right.
Force Diagram:
[1000N] ____________
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[800N] ____________|
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[-200N] ___________|
Where the arrow pointing to the right represents the force acting to the right, and the arrow pointing to the left represents the force acting to the left.
The force of 1000 N is the force of the wind pushing the car to the right. The force of 200 N is the friction acting on the car from the road trying to slow it down. The force of 800 N is the force provided by the car's engine pushing the car to the right.