Problem statements
Solution video – H2.A
Solution video – H2.B
Reminder: Please submit HW2.B for grading. HW2.A is a practice problem.
No credit will be given for submitting the wrong homework assignment.
DISCUSSION THREAD
Please post questions here on the homework, and take time to answer questions posted by others. You can learn both ways.
In the solution video for H2.A it states:
Force vector F2= F2(-0.6i-0.8j). Where did -0.6 and -0.8 come from?
As shown in the diagram, the small triangle next to F2 indicates that the horizontal and vertical components of the force have a ratio of 3:4.
Therefore, the corresponding unit vector in the direction of the force has components 3/5 i + 4/5j, since the hypotenuse of a 3−4−5 triangle is 5.
Since the force vector F2 points to the left and downward, both its x- and y-components are negative. Therefore, the unit vector in the direction of F2 is-3/5 i – 4/5j.