The net force on the car acts on the line between the center of the car
and the center of the circle.
Its strength depends on the size of the circle and the speed of the car.
Yes. The force is called a centripetal force and acts towards the centre of the circle that the car is travelling in. It is provided by friction between the road and the tyres if the road is flat, and also some normal force if the road has a camber to it.
We can't tell from the information given. If the direction of the car's motion is
changing, even if its speed is constant, then there must be a net force acting
on it.
And even if the speed were changing, you'd have to give us the car's mass and
the rate at which the speed is changing, before we could calculate the net force
that's producing the change.
Yes, it is accelerating into a different velocity (i.e. direction)
yes because it has a force to move the race car
The car must overcome friction, tire deformation, and air resistance so to maintain a constant velocity work must be done.
If the car is moving in a constant direction at a constant speed,
then the net force on it is zero.
FLUID FRICTION
Centripetal force (friction).
When you say 'moving to the left' I presume you mean with a degree of left turn of the steering wheel rather than the car has turned into a left hand direction and is now moving straight ahead in the new direction. In which case, yes, there is force acting on it. Newton's first law dictates that there must be, otherwise it would not continue to change direction. The force comes from the ground which pushes against the tyres.
friction is the reaction to motion
A car starting from rest, a rocket lift-off, etc.
If the subway car is moving at a constant velocity, meaning its acceleration is zero, then the net force is zero. Fnet = ma.
Not always, the unbalanced force only points in the direction of the acceleration so a body may be moving in the opposite direction. Example. A car moves with some speed to the right on a horizontal surface and lock the brakes, if the surface has friction, but the net force acting on it is equal to the frictional force pointing left and produces a Deceleration of carriage until stop, but while this happens continuously in motion to the right.
The friction force acting upon the turned wheels of the car cause an unbalanced force upon the car and a subsequent acceleration.
Somebody pushing the car; friction slowing down the car; gravity acting on the car (this is especially relevant if the car is going up or down a slope); the engine pushing the car forwards.
No,because if the car is moving at a constant velocity that means the acceleration is zero. So the net force is zero and there may be some forces acting on it. Only gravity, downward.
There are forces acting on the car. They are just equal to the force of the car acting on the force. In example, gravity is acting on the car, but the car is pushing back equally. Therefore, the car doesn't move.
Moving at a constant speed if your in the car then there are no forces acting on you from the car. If the car accelerates then the car will push you forward and you will feel the Force of the seat pushing you. The only other force on you in a car is gravity witch always pulls straight down. Gravity is always there whether the car is accelerating or not.
Friction
Not all moving objects accelerate. In general, an object will accelerate if there is a net force acting on it. For a ball in the air, this might be gravitation + air resistance; for a moving car (once you turn the engine off) it might be the force of friction; etc.
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.
1) There are always frictional forces, which by themselves would slow the car down. 2) Since we are assuming that the car is moving at a uniform speed, there must be another force to compensate for the friction, and in the opposite direction (pulling the car forward). This force is related to the effort done by the engine.
There are forces acting on the car. They are just equal to the force of the car acting on the force. In example, gravity is acting on the car, but the car is pushing back equally. Therefore, the car doesn't move.
When a force is acting on an object, there is always another equal and opposite force acting upon it. For example; a car that is travelling forward has a force of 'Thrust' which is pulling the car forward, as this occurs, 'Drag' or 'Air resistance' is also acting upon the car.
Gravity & Friction & support