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 9-kg mass if it is accelerating at a rate of 3 m/sec
^{2}
?
0 nts
3.33 x 10
^{-1}
nts
2.7 x 10
^{1}
nts
1.2 x 10
^{1}
nts
omit
Question 2
What is the magnitude of the frictional force present if a 9-kg mass being pulled by a horizontal force of 8 newtons towards the right experiences an acceleration of -0.11 m/sec
^{2}
?
9 x 10
^{0}
nts
8.18 x 10
^{1}
nts
8.08 x 10
^{0}
nts
9.9 x 10
^{-1}
nts
omit
Question 3
A 9-kg mass experiences two vertical forces: 61.3 newtons pulling upward and 88.2 newtons pulling downward. What acceleration does the 9-kg mass undergo?
26.9 m/sec
^{2}
16.6 m/sec
^{2}
-3.0 m/sec
^{2}
-17.9 m/sec
^{2}
omit
Question 4
A 9-kg mass is being pulled towards the right with a rope that has a tension of 56 newtons at an angle of 40 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
0.8 m/sec
^{2}
4.0 m/sec
^{2}
6.2 m/sec
^{2}
4.8 m/sec
^{2}
omit
Question 5
A 16-gram bullet travelling at 40 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 40 centimeters, what average resistive force did the tree exert upon it?
-3.2 x 10
^{2}
nts
-6.4 x 10
^{-1}
nts
-3.2 x 10
^{1}
nts
-1.6 x 10
^{0}
nts
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