Angle in degrees btwn f1 and f2

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The discussion focuses on calculating the angle between two forces, f1 and f2. The force f1 is 5 N acting at an angle of 53.1° counterclockwise from the x-axis, while f2 is represented as the vector 6i - 3j N. Two methods are suggested for finding the angle: converting f1 into its component form to use the dot product or converting f2 into polar form and subtracting the angles. Both approaches will yield the same result for the angle between the two forces.

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hatrk219
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A force, f1, of 5 N acts in a direction 53.1° counter clockwise from the x-axis. A second force, f2, is given by f2 = 6i-3j N. What is the angle in degrees between f1 and f2? thanks!
 
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hatrk219 said:
A force, f1, of 5 N acts in a direction 53.1° counter clockwise from the x-axis. A second force, f2, is given by f2 = 6i-3j N. What is the angle in degrees between f1 and f2? thanks!
Hi hatrk219 and welcome to PF,

We don't just dole out answers here, we'll help you along the way, but you have to do some work yourself. How do you think you should approach the question?
 
I can think of two ways to do that:

1) Write f1, which is given in terms of length and direction, in terms of components and use the dot product, or

2) Write f2, which is given in terms of components, in terms of length and direction, and subtract the angles.
 

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