Two constant forces act on mass m=8.0 kg. The two forces are
F1
=
(-12 N)
^
j
F2
=
(20 N)cos37o
^
i
+(20 N)sin37o
^
j
Assume that there are NO other forces acting.
(a) Draw a reference frame, place the mass anywhere, and draw in the
two forces.
(b) Calculate the net force acting on the mass.
Fnet
=
F1+F2
=
(-12 N)
^
j
+(16 N)
^
i
+(12 N)
^
j
=
(+16 N)
^
i
(c) Calculate the acceleration (in vector form) of the mass.
a
=
Fnet
m
=
(+16 N)
^
i
8.0 kg
=
(+2.0 m/s2)
^
i
THE ACCELERATION IS TOTALLY IN THE X-DIRECTION.
(d) If the object started out at the origin from rest, where is it
located and what is its velocity after 3.0 s?
x
=
at2/2
=
(2.0 m/s2)(3.0 s)2/2
=
9.0 m
vx
=
at
=
(2.0 m/s2)(3.0 s)
=
6.0 m/s
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version 3.85. On 06 Oct 2015, 15:19.