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 9-kg mass if it is accelerating at a rate of 4 m/sec
2
?
4.44 x 10
-1
nts
1.3 x 10
1
nts
3.6 x 10
1
nts
0 nts
omit
Question 2
What is the magnitude of the frictional force present if a 9-kg mass being pulled by a horizontal force of 9 newtons towards the right experiences an acceleration of -1 m/sec
2
?
9 x 10
0
nts
1 x 10
0
nts
1.8 x 10
1
nts
9 x 10
0
nts
omit
Question 3
A 9-kg mass experiences two vertical forces: 67.1 newtons pulling upward and 88.2 newtons pulling downward. What acceleration does the 9-kg mass undergo?
-2.3 m/sec
2
17.3 m/sec
2
21.1 m/sec
2
-12.1 m/sec
2
omit
Question 4
A 9-kg mass is being pulled towards the right with a rope that has a tension of 63 newtons at an angle of 30 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
6.1 m/sec
2
2.6 m/sec
2
7.0 m/sec
2
3.5 m/sec
2
omit
Question 5
A 18-gram bullet travelling at 80 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 30 centimeters, what average resistive force did the tree exert upon it?
-4.8 x 10
0
nts
-1.92 x 10
2
nts
-1.44 x 10
0
nts
-1.92 x 10
3
nts
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