In each case, lifting or pushing, why must you exert a force to move the object? q1-2: how much more effort is required to lift or push two bricks or masses instead of just one?

Explanation:

A force is required to move an object because the object will stay at rest until a force is applied.

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The effort required to lift or push two masses instead of one depends on the desired effect. For the same kinetic energy, no more effort is required. For the same momentum, half the effort is required for two masses. For the same velocity, double the effort is required.

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide