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 3-kg mass if it is accelerating at a rate of 3 m/sec
2
?
1 x 10
0
nts
6 x 10
0
nts
9 x 10
0
nts
0 nts
omit
Question 2
What is the magnitude of the frictional force present if a 3-kg mass being pulled by a horizontal force of 5 newtons towards the right experiences an acceleration of 0.67 m/sec
2
?
2.01 x 10
0
nts
4.48 x 10
0
nts
2.49 x 10
0
nts
3 x 10
0
nts
omit
Question 3
A 3-kg mass experiences two vertical forces: 71.2 newtons pulling upward and 29.4 newtons pulling downward. What acceleration does the 3-kg mass undergo?
41.8 m/sec
2
33.5 m/sec
2
44.8 m/sec
2
13.9 m/sec
2
omit
Question 4
A 3-kg mass is being pulled towards the right with a rope that has a tension of 35 newtons at an angle of 34 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
9.7 m/sec
2
6.5 m/sec
2
3.1 m/sec
2
11.7 m/sec
2
omit
Question 5
A 10-gram bullet travelling at 60 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?
-5.29 x 10
2
nts
-5.29 x 10
1
nts
-6 x 10
-1
nts
-1.76 x 10
0
nts
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