Forces acting on a moving car

1. The problem statement, all variables and given/known data
When the car is at rest, normal reaction 1 and 2 act on the car’s front wheel and rear wheel respectively . The problem is when the car starts to accelerates by rotating the wheels ,how would the normal reaction force change?

2. Relevant equations

3. The attempt at a solution
I dont understand why the normal reaction force action on the rear wheel will increase after accelerating. I am much obliged if one can help me 🙂

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