My book says:
Energy is the capacity to do work and work is the product of net force and the 1-dimensional distance it made a body travel while constantly affecting it.
This seems quite unmotivated to me.
Why does work equal $F \cdot d$ ?
Where does the distance part come from?
I always thought of time as the one thing we can only measure (not affect) so it justifies why we may measure other things in relation to time. But we have a much greater control over distance (since it's just a term for a physical dimension we can more or less influence as opposed to time).
Edit: That^ doesn't make much sense, but it's been graciously addressed in some of the answers.
Level: High-school Physics.
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