A car is moving north and speeding up to pass a truck on a level road. The combi

Question

A car is moving north and speeding up to pass a truck on a level road. The combined contact force exerted on the road by all four tires has a verticle component 11.0 kN downward and horizontal component 3.3 kN southward. The drag forces exerted on the car by the air is 1.2 kN southward. What is the weight of the car? What is the net force acting on the car?

I think I understand why the weight is 11 kN. It's because that is the total contact force exerted on the road. I am wondering if this reasoning is correct?

Also the answer to the net force is 2.1 kN northward. I am confused about this answer. Obviously if you subtract 3.3-1.2 you get the answer. But why? The question says the forces are moving southward. I understand that friction will make it go forward. I thought that if the question said both forces were southward that would mean you would add them together? Why does this change?

Thanks for you help!

Explanation / Answer

A car is moving north and speeding up to pass a truck on a level road. The combined contact force exerted on the road by all four tires has a verticle component 11.0 kN downward and horizontal component 3.3 kN southward. The drag forces exerted on the car by the air is 1.2 kN southward. What is the weight of the car? What is the net force acting on the car?

I think I understand why the weight is 11 kN. It's because that is the total contact force exerted on the road. I am wondering if this reasoning is correct?

here you are correct.

Also the answer to the net force is 2.1 kN northward. I am confused about this answer. Obviously if you subtract 3.3-1.2 you get the answer.

the reason is when a car is moving

the friction force from the road surface act in the direction of the car's movement. .

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.