This situation is an example of Newton's 2nd Law, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma). In this case, as the ice skater pushes harder with his leg muscles, he is applying a greater force, which results in greater acceleration.
As an ice skater pushes harder with his leg muscles, he begins to accelerate faster. This is an example of
Newton's 3rd Law
Newton's 1st Law
Newton's 4th Law
Newton's 2nd Law
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