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 2-kg mass if it is accelerating at a rate of 5 m/sec
^{2}
?
1 x 10
^{1}
nts
7 x 10
^{0}
nts
0 nts
2.5 x 10
^{0}
nts
omit
Question 2
What is the magnitude of the frictional force present if a 2-kg mass being pulled by a horizontal force of 7 newtons towards the right experiences an acceleration of 0.5 m/sec
^{2}
?
7 x 10
^{0}
nts
6 x 10
^{0}
nts
1 x 10
^{0}
nts
4 x 10
^{0}
nts
omit
Question 3
A 2-kg mass experiences two vertical forces: 69.6 newtons pulling upward and 19.6 newtons pulling downward. What acceleration does the 2-kg mass undergo?
50.0 m/sec
^{2}
44.6 m/sec
^{2}
25.0 m/sec
^{2}
52.0 m/sec
^{2}
omit
Question 4
A 2-kg mass is being pulled towards the right with a rope that has a tension of 49 newtons at an angle of 30 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
21.2 m/sec
^{2}
12.2 m/sec
^{2}
24.5 m/sec
^{2}
9.0 m/sec
^{2}
omit
Question 5
A 14-gram bullet travelling at 60 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 30 centimeters, what average resistive force did the tree exert upon it?
-8.4 x 10
^{2}
nts
-2.8 x 10
^{0}
nts
-8.4 x 10
^{1}
nts
-8.4 x 10
^{-1}
nts
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