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 5 m/sec
2
?
1.5 x 10
1
nts
1.67 x 10
0
nts
0 nts
8 x 10
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 10 newtons towards the right experiences an acceleration of 0.33 m/sec
2
?
9.9 x 10
-1
nts
1.01 x 10
1
nts
9 x 10
0
nts
9.09 x 10
0
nts
omit
Question 3
A 3-kg mass experiences two vertical forces: 66 newtons pulling upward and 29.4 newtons pulling downward. What acceleration does the 3-kg mass undergo?
39.6 m/sec
2
12.2 m/sec
2
31.8 m/sec
2
36.6 m/sec
2
omit
Question 4
A 3-kg mass is being pulled towards the right with a rope that has a tension of 70 newtons at an angle of 36 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
23.3 m/sec
2
18.9 m/sec
2
13.7 m/sec
2
5.2 m/sec
2
omit
Question 5
A 20-gram bullet travelling at 70 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 36 centimeters, what average resistive force did the tree exert upon it?
-3.89 x 10
0
nts
-1.4 x 10
0
nts
-1.36 x 10
2
nts
-1.36 x 10
3
nts
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