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 6 m/sec
2
?
8 x 10
0
nts
3 x 10
0
nts
1.2 x 10
1
nts
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
1 x 10
0
nts
8 x 10
0
nts
4 x 10
0
nts
omit
Question 3
A 2-kg mass experiences two vertical forces: 74.1 newtons pulling upward and 19.6 newtons pulling downward. What acceleration does the 2-kg mass undergo?
27.2 m/sec
2
56.5 m/sec
2
46.8 m/sec
2
54.5 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 28 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
24.5 m/sec
2
11.5 m/sec
2
10.1 m/sec
2
21.6 m/sec
2
omit
Question 5
A 14-gram bullet travelling at 70 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 28 centimeters, what average resistive force did the tree exert upon it?
-3.5 x 10
0
nts
-9.8 x 10
-1
nts
-1.23 x 10
3
nts
-1.23 x 10
2
nts
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