Question

The net force on an object is zero if the two forces acting on it in which direction ? 1-opposite direction 2-same direction 3-sometimes opposite and sometimes same direction 4-all of above

Answer 1

Opposite direction.

Explanation:

The net force is the total amount of force acted on an object. It becomes `0` when the forces are equal, cancelling each other out (or balancing them - same thing).

Let's go over each option.

Opposite direction

If the forces were equal, then they would cancel each other out. This results in a net force of `0`.

However, if the forces were unequal, the overpowering force would result in motion.

[The body would move towards the left]

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Same direction

If the forces came from the same direction, this would reinforce it, causing the force to increase. Because there is no force to counter this, it will result in motion.

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Sometimes opposite and sometimes the same

This option is very confusing. If it's "sometimes", it means the duration of where the force is coming from is periodic, indicating a force acting on the object coming from one direction, which then switches to the other direction.

Although the fluctuation of direction, there is still a force being acted, and without a force to balance the other, it will result in motion.

All of the above

This is also a very confusing option. Because if they're all at the same time, it's contradicting to one of the options. Due to this awkward option, I'm going to rule this out immediately.

After reviewing all the options, we can conclude that the first option would be the correct answer.

Hope this helps :)