What is known as physics?

Answer 1

Physics is the science of modelling the universe around us in an attempt to understand the universe, and to predict its behavior, by examining and manipulating the model.

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For example, a common model in physics is the mathematical equation:

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F = ma.

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This model (an equation can be a model) accurately and completely predicts what force is needed ('F') to accelerate ('a') a body of a certain mass ('m'). By manipulating this model - by plugging in various values for F, m, and/or a, we can understand and predict the relationship in the real world between force and acceleration.