Everything else in the car that is not itself rotating etc. is at rest relative to the passenger -- the seats, car body, dashboard, windows, etc, "At rest" is in this case just another way to say "moving at the same velocity."
The seated passenger in a moving car is at rest relative to the car's interior.
Motion and rest are relative concepts in physics, meaning that an object can be in motion or at rest depending on the frame of reference. For example, a person seated in a moving train is at rest relative to the train but in motion relative to an observer outside the train. This demonstrates how motion and rest are interconnected depending on the chosen point of view.
You can be at rest and moving at the same time in a rotating reference frame. For example, if you are sitting in a car that is moving at a constant speed on a circular track, you are at rest relative to the car but moving in a circle relative to an observer on the ground.
One situation where you can be at rest and moving at the same time is when you are inside a moving vehicle. While you are stationary relative to the vehicle (at rest), you are moving relative to an observer outside the vehicle.
the passenger will be at rest relative to the rear car of the train, as they are both moving at the same speed and direction.
The seated passenger in a moving car is at rest relative to the car's interior.
the seat
Motion and rest are relative concepts in physics, meaning that an object can be in motion or at rest depending on the frame of reference. For example, a person seated in a moving train is at rest relative to the train but in motion relative to an observer outside the train. This demonstrates how motion and rest are interconnected depending on the chosen point of view.
You can be at rest and moving at the same time in a rotating reference frame. For example, if you are sitting in a car that is moving at a constant speed on a circular track, you are at rest relative to the car but moving in a circle relative to an observer on the ground.
Being at rest is a relative term. Relative to earth we are at rest when we are sitting down. However, you are moving because the earth is moving its orbit around the sun.
Being at rest is a relative term. Relative to earth we are at rest when we are sitting down. However, you are moving because the earth is moving its orbit around the sun.
One situation where you can be at rest and moving at the same time is when you are inside a moving vehicle. While you are stationary relative to the vehicle (at rest), you are moving relative to an observer outside the vehicle.
the passenger will be at rest relative to the rear car of the train, as they are both moving at the same speed and direction.
The passenger in the rear seat of a car moving at a steady speed is at rest relative to the car itself. This is because the passenger is moving with the same velocity as the car, so they appear to be at rest relative to each other.
The pen is at rest as long as it is not moving relative to its surroundings. If the pen is stationary, it is considered to be at rest.
Actually sitting on the earth we feel as if we are at rest. But relative to the pole star we are moving along a circular path. Also relative to the sun we are moving along an elliptical path around the sun. So actually speaking we are not at rest. In the same nothing is stationary. Everything is in motion. Rest means only a relative term.
Relative to the car, you are at rest. Relative to the road, you are moving if the car is in motion. Relative to the sun, you are moving with the Earth's rotation and orbit around the sun.