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 4-kg mass if it is accelerating at a rate of 4 m/sec
2
?
1.6 x 10
1
nts
0 nts
8 x 10
0
nts
1 x 10
0
nts
omit
Question 2
What is the magnitude of the frictional force present if a 4-kg mass being pulled by a horizontal force of 8 newtons towards the right experiences an acceleration of 0 m/sec
2
?
8 x 10
0
nts
0 x 10
0
nts
Infinity nts
Infinity nts
omit
Question 3
A 4-kg mass experiences two vertical forces: 72.9 newtons pulling upward and 39.2 newtons pulling downward. What acceleration does the 4-kg mass undergo?
8.4 m/sec
2
28.0 m/sec
2
33.7 m/sec
2
37.7 m/sec
2
omit
Question 4
A 4-kg mass is being pulled towards the right with a rope that has a tension of 56 newtons at an angle of 35 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
3.4 m/sec
2
11.5 m/sec
2
14.0 m/sec
2
8.0 m/sec
2
omit
Question 5
A 16-gram bullet travelling at 50 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?
-8 x 10
-1
nts
-5.71 x 10
1
nts
-2.29 x 10
0
nts
-5.71 x 10
2
nts
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