# Application of pseudo force in the given question

Question (17.38, Hibbeler Dynamics SI Edition):

A force of $$P = 300\,\mathrm N$$ is applied to the $$60\:\text{kg}$$ cart. Determine the reactions at both the wheels at A and both the wheels at B. Also, what is the acceleration of the cart? The mass center of the cart is at G.

In the question above, we can clearly see that the force is pulling towards the left, and hence the acceleration of $$4.33\: \text{m/s}^2$$ occurs towards the left. But while solving for the reaction forces at the wheels of the cart, why do we consider the force $$ma$$ acting towards the right? This question is from an exercise that has a lot of questions involving pseudo/d'Alembert forces.