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# Newton's Second Law

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1. Newton's 2nd Law states that rate of change of momentum is directly proportional to the resultant force. F=dp/dt.
Doesn't resultant force equal to rate of change of momentum? Why is it directly proportional instead of equal as stated in the law?

Thanks so much!!!
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2. (Original post by chinut)
Newton's 2nd Law states that rate of change of momentum is directly proportional to the resultant force. F=dp/dt.
Doesn't resultant force equal to rate of change of momentum? Why is it directly proportional instead of equal as stated in the law?

Thanks so much!!!
Directly proportional means there is a constant relating the two quantities. In this case, that constant is just 1 which makes it equal
3. As rate of change of momentum rises force rises. Hence; they are directly proportional.
4. (Original post by lyamlim97)
Directly proportional means there is a constant relating the two quantities. In this case, that constant is just 1 which makes it equal
So the constant will always be 1 and it's correct to say force equals to rate of change of momentum. Am i right? Thx!!

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