Practice Problems
Net F = ma
Directions:
On this worksheet, positive horizontal directions are towards the right and positive vertical directions are upwards.
omit
Question 1
What is the net force acting on a 3-kg mass if it is accelerating at a rate of 5 m/sec
^{2}
?
1.67 x 10
^{0}
nts
8 x 10
^{0}
nts
1.5 x 10
^{1}
nts
0 nts
omit
Question 2
What is the magnitude of the frictional force present if a 3-kg mass being pulled by a horizontal force of 5 newtons towards the right experiences an acceleration of -1.33 m/sec
^{2}
?
2.26 x 10
^{0}
nts
1.25 x 10
^{0}
nts
9 x 10
^{0}
nts
3.99 x 10
^{0}
nts
omit
Question 3
A 3-kg mass experiences two vertical forces: 16.9 newtons pulling upward and 29.4 newtons pulling downward. What acceleration does the 3-kg mass undergo?
15.4 m/sec
^{2}
-4.2 m/sec
^{2}
12.5 m/sec
^{2}
-9.5 m/sec
^{2}
omit
Question 4
A 3-kg mass is being pulled towards the right with a rope that has a tension of 35 newtons at an angle of 43 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
8.5 m/sec
^{2}
8.0 m/sec
^{2}
0.6 m/sec
^{2}
11.7 m/sec
^{2}
omit
Question 5
A 10-gram bullet travelling at 90 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 43 centimeters, what average resistive force did the tree exert upon it?
-9 x 10
^{-1}
nts
-9.42 x 10
^{1}
nts
-9.42 x 10
^{2}
nts
-2.09 x 10
^{0}
nts
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