I Can You Explain: Why Is It One Sec?

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The discussion clarifies the concept of "per second" as a rate rather than simply "one second." It explains that momentum is defined as mass multiplied by velocity, and when considering momentum per second, it involves dividing by time. The relationship between velocity and time leads to the definition of acceleration. The force is described as the change in momentum per unit time, expressed through the equation F=ma, where acceleration is calculated as the change in velocity over time. This foundational understanding of momentum and force is essential in physics.
AyoubEd
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can you help me with this, please?
 

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Firstly it doesn't say "one second" it says "per second" which is a rate.

Momentum = mass * velocity
so
Momentum per second would be equal to mass * velocity / time

Velocity/time = acceleration.

can you do the rest?
 
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Force is the change in momentum per unit time.
F=ma (m=mass a=acceleration)
a= (vf-vi)/t
Replacing a into the force equation:

F=m (vf-vi)/t
Which is change in momentum per unit time.
 
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