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 6 m/sec
^{2}
?
0 nts
1.8 x 10
^{1}
nts
9 x 10
^{0}
nts
2 x 10
^{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 10 newtons towards the right experiences an acceleration of -0.67 m/sec
^{2}
?
2.01 x 10
^{0}
nts
4.98 x 10
^{0}
nts
1.2 x 10
^{1}
nts
4.48 x 10
^{0}
nts
omit
Question 3
A 3-kg mass experiences two vertical forces: 20.9 newtons pulling upward and 29.4 newtons pulling downward. What acceleration does the 3-kg mass undergo?
-5.5 m/sec
^{2}
8.5 m/sec
^{2}
-2.8 m/sec
^{2}
16.8 m/sec
^{2}
omit
Question 4
A 3-kg mass is being pulled towards the right with a rope that has a tension of 70 newtons at an angle of 25 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
23.3 m/sec
^{2}
11.3 m/sec
^{2}
21.1 m/sec
^{2}
9.9 m/sec
^{2}
omit
Question 5
A 20-gram bullet travelling at 90 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 25 centimeters, what average resistive force did the tree exert upon it?
-3.24 x 10
^{2}
nts
-7.2 x 10
^{0}
nts
-3.24 x 10
^{3}
nts
-1.8 x 10
^{0}
nts
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