The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless upon by an unbalanced force.

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Explanation:

In order for something to start moving, you need to apply a force to it or something else needs to apply a force to it. That is the same for stopping an object, some force needs to stop it. It could be your hand or it could be gravity.

answer: electrons

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.