Practice Problems
Net F = ma
Topics:
On this worksheet positive horizontal directions are towards the right and positive vertical directions are upwards.
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omit
Question 1
What is the net force acting on a 8-kg mass if it is accelerating at a rate of 6 m/sec
2
?
0 nts
1.4 x 10
1
nts
7.5 x 10
-1
nts
4.8 x 10
1
nts
omit
Question 2
What is the magnitude of the frictional force present if a 8-kg mass being pulled by a horizontal force of 10 newtons towards the right experiences an acceleration of -2.75 m/sec
2
?
4.55 x 10
-1
nts
2.2 x 10
1
nts
2.91 x 10
0
nts
3.2 x 10
1
nts
omit
Question 3
A 8-kg mass experiences two vertical forces: 64.2 newtons pulling upward and 78.4 newtons pulling downward. What acceleration does the 8-kg mass undergo?
17.8 m/sec
2
-6.2 m/sec
2
14.2 m/sec
2
-1.8 m/sec
2
omit
Question 4
A 8-kg mass is being pulled towards the right with a rope that has a tension of 70 newtons at an angle of 34 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
4.9 m/sec
2
2.4 m/sec
2
7.3 m/sec
2
8.8 m/sec
2
omit
Question 5
A 20-gram bullet travelling at 40 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 34 centimeters, what average resistive force did the tree exert upon it?
-4.71 x 10
1
nts
-4.71 x 10
2
nts
-2.35 x 10
0
nts
-8 x 10
-1
nts
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