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 3 m/sec
2
?
0 nts
6 x 10
0
nts
1 x 10
0
nts
9 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 8 newtons towards the right experiences an acceleration of 1.67 m/sec
2
?
3 x 10
0
nts
1.6 x 10
0
nts
5.01 x 10
0
nts
1.8 x 10
0
nts
omit
Question 3
A 3-kg mass experiences two vertical forces: 43.5 newtons pulling upward and 29.4 newtons pulling downward. What acceleration does the 3-kg mass undergo?
24.3 m/sec
2
17.1 m/sec
2
14.1 m/sec
2
4.7 m/sec
2
omit
Question 4
A 3-kg mass is being pulled towards the right with a rope that has a tension of 56 newtons at an angle of 25 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
9.0 m/sec
2
18.7 m/sec
2
7.9 m/sec
2
16.9 m/sec
2
omit
Question 5
A 16-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?
-8 x 10
1
nts
-8 x 10
2
nts
-8 x 10
-1
nts
-3.2 x 10
0
nts
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