Exercise 5.14 for a car with four-wheel drive.
Step-by-step solution Step 1 of 6 The free body diagram of the inclined plane is given below. The component of weight of the object is taken Here is the mass, is the coefficient of static friction and is the normal force. Step 2 of 6 Balance the forces in the direction, The object is in equilibrium in Y axis The total normal force acting on the four wheels. Step 3 of 6 The object is accelerating in X axis. The four wheel are driving wheels. So the total statics friction force on the wheels is pulling the object uphill.