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 5-kg mass if it is accelerating at a rate of 6 m/sec
^{2}
?
0 nts
3 x 10
^{1}
nts
1.1 x 10
^{1}
nts
1.2 x 10
^{0}
nts
omit
Question 2
What is the magnitude of the frictional force present if a 5-kg mass being pulled by a horizontal force of 10 newtons towards the right experiences an acceleration of -2 m/sec
^{2}
?
1 x 10
^{1}
nts
1 x 10
^{0}
nts
2 x 10
^{1}
nts
2.5 x 10
^{0}
nts
omit
Question 3
A 5-kg mass experiences two vertical forces: 38.1 newtons pulling upward and 49 newtons pulling downward. What acceleration does the 5-kg mass undergo?
17.4 m/sec
^{2}
10.9 m/sec
^{2}
-5.9 m/sec
^{2}
-2.2 m/sec
^{2}
omit
Question 4
A 5-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?
14.0 m/sec
^{2}
6.8 m/sec
^{2}
5.9 m/sec
^{2}
12.7 m/sec
^{2}
omit
Question 5
A 20-gram bullet travelling at 50 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?
-1 x 10
^{2}
nts
-4 x 10
^{0}
nts
-1 x 10
^{0}
nts
-1 x 10
^{3}
nts
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