This weekend, me and my brother went running after a workout. Newton's second law states acceleration equals to Net Force divided by mass. Both of us are about equally as strong so our Net Force when running will be about the same but the difference is in our mass. My brother weighs about 30 more pounds than me so he has more mass. Newton's law states that the more mass an object has the more inertia it has. when my brother and I were running 40 yard sprints we were starting at a speed of zero and a net force of zero. At the start, we both had about the same net force when accelerating to our top speed but because my brother had more mass it takes more force to change his momentum because he has more tendency to stay in whatever motion hes in due to inertia. I was quicker to the 40 yard line because i had more acceleration. However, we also ran a mile after and the results were different. I was a little faster at the start because i had faster acceleration but my brother was able to keep up with me easily because the weight difference only affects our acceleration.
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