A ball is rolling straight across the floor until Bradley kicks it. is this newton's first law, 2nd law or third?
This situation is an example of Newton's first law, also known as the law of inertia. This law states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and direction, unless acted upon by an external force. In this case, the ball was already rolling straight across the floor and would continue to do so unless Bradley's kick acted as an external force to change its motion.
To determine which law of motion is involved in the scenario you described, we need to understand the three laws of motion formulated by Sir Isaac Newton:
1. Newton's First Law of Motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will continue moving in a straight line at a constant velocity unless acted upon by an external force.
2. Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. It can be represented by the equation F = ma, where F represents the net force applied to the object, m is the object's mass, and a denotes its acceleration.
3. Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction.
Based on the scenario you provided, it can be concluded that Newton's First Law of Motion is applicable. The ball was initially rolling straight across the floor, indicating that it had a constant velocity. However, after Bradley kicked the ball, an external force was applied to it, causing its motion to change. This change signifies the involvement of an external force, which aligns with Newton's First Law of Motion.
Therefore, the correct answer is Newton's First Law of Motion.