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 7-kg mass if it is accelerating at a rate of 5 m/sec
2
?
7.14 x 10
-1
nts
0 nts
1.2 x 10
1
nts
3.5 x 10
1
nts
omit
Question 2
What is the magnitude of the frictional force present if a 7-kg mass being pulled by a horizontal force of 9 newtons towards the right experiences an acceleration of -1.71 m/sec
2
?
4.09 x 10
0
nts
2.1 x 10
1
nts
7.52 x 10
-1
nts
1.2 x 10
1
nts
omit
Question 3
A 7-kg mass experiences two vertical forces: 64.8 newtons pulling upward and 68.6 newtons pulling downward. What acceleration does the 7-kg mass undergo?
3.8 m/sec
2
-0.5 m/sec
2
19.1 m/sec
2
3.2 m/sec
2
omit
Question 4
A 7-kg mass is being pulled towards the right with a rope that has a tension of 63 newtons at an angle of 25 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
8.2 m/sec
2
3.8 m/sec
2
4.4 m/sec
2
9.0 m/sec
2
omit
Question 5
A 18-gram bullet travelling at 90 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?
-6.48 x 10
0
nts
-2.92 x 10
2
nts
-1.62 x 10
0
nts
-2.92 x 10
3
nts
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