What forces are acting on a still car and a car that is slowing down?

Answer 1

There are more than two forces acting on a moving car. The force of gravity keeps the car on the ground, and the normal force from the ground keeps the car from falling to the center of the earth. When the engine is running, it creates a torque which is transferred to the car's tires. Due to small and large cracks and crevices in the road and tires the two surfaces keep getting stuck together. The force must go somewhere, so the car is now applying a force on the road in the direction the wheels are rotating. Newton's 3rd law states that, "For every action, there is an equal and opposite reaction," therefore the road also applies a force to the car. This force is called a frictional force. It is static friction if the car is moving, and the tires are not sliding; it is kinetic friction if the car is moving, but the tires are sliding. This frictional force is what propels the car and is greater as static friction. The last force acting on a moving car is the drag force or air resistance and it is caused by particles of air running into the car, slowing it down.

Answer 2

There are many forces that can slow down a car. The one most people think of is friction in the brakes. The brakes squeeze the wheel rotors, which slows down the car. There is also a small force of air resistance on the car when it is moving, and that will slow it down slightly. Another force that can slow down a car is gravity, when a car is going up a hill.

Answer 3

Typical forces acting on a moving object are gravity, frictional forces, and normal forces. Gravity is obvious here, friction impedes motion, and the normal force keeps the object from falling through whatever surface it is moving on. If the body is in free-fall, there, of course, is no normal force, and in many applications, the friction may be neglected as well.

Movement in and of itself is not a "force". If the movement is at a constant speed (not moving directions, not speeding up or slowing down), then there are no other forces than the above. If the movement is changing directions or speeding up or down, then some acceleration is acting upon the object, and the according force is equal to the object's mass times that acceleration.

Answer 4

The question is a lot like asking: "How old is a smiling person ?"

You've told us nothing about the object except that it's moving, and

that fact reveals nothing about any forces that may be acting on it.

Answer 5

The engine's force and frictional force are equal and opposite. Hence no net force and so no acceleration. That is why same speed

Answer 6

no more force

Answer 7

fricton