PHYSICS 1306, QUIZ 2
Chapter 4
July 21, 2003
Partial credit will be LIBERAL, provided that you show your work!
USE BACK IF NECESSARY!
Name: ______________________
1.
Social Security Number ______________________
(10 points) Newton’s Laws
a. Using complete, grammatically correct English sentences, state Newton’s 1st Law of Motion.
b.
Using complete, grammatically correct English sentences, state Newton’s 3rd Law of Motion.
2.
(20 points)
See the figure. A mass m = 25 kg at the origin is acted on by two forces which make
a 120° angle with each other. F2 = 15 N and is directed along the positive y-axis. F1 = 10 N and
is directed as is shown in the figure.
a.
In the coordinate system shown in the figure, compute the x and y components of the
forces F1 and F2.
b.
Using the analytic (trigonometric) method of vector addition, compute the x and y components of
the resultant force F = F1 + F2 and the magnitude and direction of F.
c.
Write the two equations which result by applying Newton’s 2nd Law to this problem in the x and y
directions.
d.
Use the equations of part c to find the x and y components of the acceleration of the mass. Also
find the magnitude and direction of this acceleration.