# Resultant Forces. Need Help!

That If Two Forces act at An angle theta, The resultant Force is

$$\sqrt{{a}^{2}+{b}^{2}-2 Cos Theta}$$

Is it Correct? Also, I want to Know, If a force acts At an Angle Theta From horizontal, What is the Resultant Force?

Kindly Provide me With the Formulas. I shall study Further From the Wiki. Thanks!

Note by Mehul Arora
3 years, 1 month ago

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It is $$\sqrt{a^2 + b^2 + 2ab\cos(\theta)}$$, where $$\theta$$ is the angle between the two vectors.

Edited for clarity.

- 3 years, 1 month ago

Between The root of the Two vectors means? Can you give an example?

- 3 years, 1 month ago

:/ I don't know why I wrote that.Disregard that. Basically, the angle between the vectors has to be taken when both of them have the same starting point. For example, this is the correct angle,

Img

While the angles in the pic below this is wrong. Notice how the vectors don't have the same starting points in the example below.

Img

- 3 years, 1 month ago

Okay! If a force acts At an Angle Theta From horizontal, What is the Resultant Force?

- 3 years, 1 month ago

If there is exactly one force, then the resultant force would be equal to the force itself.

- 3 years, 1 month ago

I got it. Thanks For your help @Siddhartha Srivastava

- 3 years, 1 month ago