1. Balanced and Unbalanced Forces 9 ; :
The the brakes are decreases car are balanced, decreases. direction.
When forces, dueproduced by theair resistance, act in the oppositeforce is zero. the
Dragresultant forcefriction andand the acceleration the to the car decelerates. It
When the force to applied,the drag force increases and
forces acting on the engine is transferred resultant wheels (via
rear
stops accelerating and moves at onconstantare unbalanced and it accelerates.
transmission system) the forces a the car speed.
110 120 14
120 100 0
100
160
mph
80
130
180 20
rpm x100
80
60
40
0
140
60
22
20 0 0
150
40
20
160
1 2 3 4 5 6 7
0
Neutral
Drag Force (Thrust) Forward Force
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Resultant Force Resultant Force