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 5 m/sec
2
?
9 x 10
0
nts
1.25 x 10
0
nts
2 x 10
1
nts
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 10 newtons towards the right experiences an acceleration of -0.5 m/sec
2
?
2 x 10
0
nts
5 x 10
0
nts
8 x 10
0
nts
1.2 x 10
1
nts
omit
Question 3
A 4-kg mass experiences two vertical forces: 59.2 newtons pulling upward and 39.2 newtons pulling downward. What acceleration does the 4-kg mass undergo?
5.0 m/sec
2
20.0 m/sec
2
24.6 m/sec
2
24.0 m/sec
2
omit
Question 4
A 4-kg mass is being pulled towards the right with a rope that has a tension of 70 newtons at an angle of 44 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
17.5 m/sec
2
0.4 m/sec
2
12.2 m/sec
2
12.6 m/sec
2
omit
Question 5
A 20-gram bullet travelling at 80 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 44 centimeters, what average resistive force did the tree exert upon it?
-1.45 x 10
2
nts
-3.64 x 10
0
nts
-1.45 x 10
3
nts
-1.6 x 10
0
nts
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