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 4 m/sec
2
?
6 x 10
0
nts
0 nts
8 x 10
0
nts
2 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 8 newtons towards the right experiences an acceleration of 2 m/sec
2
?
4 x 10
0
nts
1 x 10
0
nts
4 x 10
0
nts
2 x 10
0
nts
omit
Question 3
A 2-kg mass experiences two vertical forces: 40.1 newtons pulling upward and 19.6 newtons pulling downward. What acceleration does the 2-kg mass undergo?
10.3 m/sec
2
22.5 m/sec
2
20.5 m/sec
2
29.9 m/sec
2
omit
Question 4
A 2-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?
3.5 m/sec
2
18.0 m/sec
2
21.4 m/sec
2
28.0 m/sec
2
omit
Question 5
A 16-gram bullet travelling at 60 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?
-9.6 x 10
-1
nts
-7.2 x 10
2
nts
-7.2 x 10
1
nts
-2.4 x 10
0
nts
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