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 4-kg mass if it is accelerating at a rate of 3 m/sec
2
?
0 nts
7 x 10
0
nts
7.5 x 10
-1
nts
1.2 x 10
1
nts
omit
Question 2
What is the magnitude of the frictional force present if a 4-kg mass being pulled by a horizontal force of 6 newtons towards the right experiences an acceleration of 0.5 m/sec
2
?
8 x 10
0
nts
4 x 10
0
nts
2 x 10
0
nts
3 x 10
0
nts
omit
Question 3
A 4-kg mass experiences two vertical forces: 60.1 newtons pulling upward and 39.2 newtons pulling downward. What acceleration does the 4-kg mass undergo?
24.9 m/sec
2
20.9 m/sec
2
5.2 m/sec
2
24.8 m/sec
2
omit
Question 4
A 4-kg mass is being pulled towards the right with a rope that has a tension of 42 newtons at an angle of 31 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
3.6 m/sec
2
9.0 m/sec
2
10.5 m/sec
2
5.4 m/sec
2
omit
Question 5
A 12-gram bullet travelling at 70 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 31 centimeters, what average resistive force did the tree exert upon it?
-9.48 x 10
1
nts
-9.48 x 10
2
nts
-2.71 x 10
0
nts
-8.4 x 10
-1
nts
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