Newton’s law will not hold in these frames. We can define a non-inertial frame as an accelerated frame for an inertial frame of reference.Means Newton’s can be applied to know more about the motion. Note: In the inertial frame of reference, Newton’s laws hold perfectly. We can say that the force of the Earth rotation is not applied to the car, and the car is moving with a constant speed. But we ignore that the car is experiencing some force as the Earth is constantly moving and the car is moving on the Earth surface. We see that car is moving at a constant speed. Imagine a car which moving at a constant speed, and no external force is acting upon it. We need to find a frame of reference.Īn inertial frame of reference is when force is not acting, and the body is in constant motion. So, before specifying the velocity, we have to determine which frame we are in. But if we ask the question to C, he will say that B has a velocity V in the positive side X direction. If we ask A the velocity of B, he will say it is not moving or is at rest. Here, we have two frames of reference the person in the car and the person on the bench. Therefore, to avoid such confusion, we use a frame of references. For the observer, the car is moving at the speed of 35 m/s, but for the people in the car, it seems like they are at rest and all the things outside are moving backwards. If we consider a reference frame to understand the motion, it goes like this.įor example, a car is moving at the speed of 35 m/s, and an observer B is sitting on the bench in the park. A frame of reference is applied in Physics mainly to understand the motion of the objects in that particular frame and related to another frame in the reference.
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