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 5-kg mass if it is accelerating at a rate of 6 m/sec
2
?
1.1 x 10
1
nts
1.2 x 10
0
nts
3 x 10
1
nts
0 nts
omit
Question 2
What is the magnitude of the frictional force present if a 5-kg mass being pulled by a horizontal force of 7 newtons towards the right experiences an acceleration of -2.6 m/sec
2
?
1.92 x 10
0
nts
2 x 10
1
nts
5.38 x 10
-1
nts
1.3 x 10
1
nts
omit
Question 3
A 5-kg mass experiences two vertical forces: 55.8 newtons pulling upward and 49 newtons pulling downward. What acceleration does the 5-kg mass undergo?
1.4 m/sec
2
21.0 m/sec
2
11.8 m/sec
2
6.8 m/sec
2
omit
Question 4
A 5-kg mass is being pulled towards the right with a rope that has a tension of 49 newtons at an angle of 35 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
5.6 m/sec
2
9.8 m/sec
2
8.0 m/sec
2
2.4 m/sec
2
omit
Question 5
A 14-gram bullet travelling at 80 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 35 centimeters, what average resistive force did the tree exert upon it?
-3.2 x 10
0
nts
-1.28 x 10
2
nts
-1.28 x 10
3
nts
-1.12 x 10
0
nts
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