6.2 vector addition Flashcards
How to find resultant force
Draw a line starting form initial force to the end point
What can happens to two forces acting in the same direction?
They can be added
R=F1+f2
What happens to two forces acting in opposite directions?
They are subtracted
R=F1-f2
When to use cosine law?
When you do not have a 90 degree angle
Two sides and unknown angle (angle cosy in between two side lengths)
All three side lengths
What the is Cosine law for finding a side length? What do the lower case letters represent? Uppercase?
c^2=a^2+b^2-2abcosC
lower case letters are the side lengths
Capital letters are angles
What is cosine law to find angle?
cosC=a^2+b^2+c^2/2ab
How does parallelogram law work?
When adding vectors tail to tail, a parallelogram can form a parallelogram
The resultant line will be a diagonal line starting the starting point to the end point (from tail to tail point to tip to tip point)
When to use triangle law
When adding two vectors head to tail
What is a trick to use when adding a negative vector?
Add the opposite of that vector
How to find resultant velocity relative to the ground?
Use the Pythagorean theorem where the resultant is c^2 and the other side lengths are a^2 and b^2 to find length of resultant
Use tan to find angle relative to the origin
