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AS Physics Help: Problems on Vectors and Components watch

1. Hey, I've just moved to physics so I am quite behind I am really struggling on this, even though I know the first questions are easy, but i just can't think

1. Two forces are at right angles. Going up is 6N and going across is 8N.

What is the size of the resultant force that could replace the 6N and 8N forces?

What angle does this force make with the original 8N force?

2. 4N to the left, 7N going up, 6N to the right.

What is the resultant force?

What angle does the resultant make with the original 7N force?

3. 6N going diagonally from a 30 degree angle on a line.

What is the horizontal and vertical component of the 6N force?

Thankyou!
2. (Original post by Robpattinsonxxx)
Hey, I've just moved to physics so I am quite behind I am really struggling on this, even though I know the first questions are easy, but i just can't think

1. Two forces are at right angles. Going up is 6N and going across is 8N.

What is the size of the resultant force that could replace the 6N and 8N forces?

What angle does this force make with the original 8N force?
Have you done the triangle rule?
Draw a right angle triangle with sides 6 and 8. The third side, the hypotenuse, is the resultant. [It will be found using Pythagoras to be 10N] The angle can be found from trigonometry.
2. 4N to the left, 7N going up, 6N to the right.

What is the resultant force?

What angle does the resultant make with the original 7N force?
Same as part 1 but first find the resultant of the left and right forces by subtraction. = 2N to the right. Then the triangle as before.

3. 6N going diagonally from a 30 degree angle on a line.

What is the horizontal and vertical component of the 6N force?

Thankyou!
You need to look at your notes for this. The 2 components (here) are 6Sin30 and 6cos30 but which is horizontal and vertical will depend on the diagram, it's not clear from your description
3. You construct a triangle and then use pythagorus to find the resultant vector. Or use trig SoHCAHTOA
4. Thankyou both of you
5. Deleted

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