Imagine if Newton's 2 nd law didn't work and that forces cause unpredicatble accerlations, What mght happen if you swing a bat at a baseball?
Newton's second law details the relationship between the applied force, the mass and its acceleration.
This can be expressed mathematically as -
F = m*a
Mass 'm' is constant.
So,
F a
Means, acceleration is directely proportional to the applied force.
Now, if Newton's second law didn't work and force cause unpredictable accelerations, then -
When we swing a bat at a baseball, it will cause INFINITE acceleration to the baseball.
Because, in this case acceleration(a) is not proportional to the applied force (F).
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