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 5-kg mass if it is accelerating at a rate of 4 m/sec
2
?
2 x 10
1
nts
9 x 10
0
nts
8 x 10
-1
nts
0 nts
omit
Question 2
What is the magnitude of the frictional force present if a 5-kg mass being pulled by a horizontal force of 9 newtons towards the right experiences an acceleration of -0.2 m/sec
2
?
9 x 10
0
nts
2.5 x 10
1
nts
1 x 10
0
nts
1 x 10
1
nts
omit
Question 3
A 5-kg mass experiences two vertical forces: 37.9 newtons pulling upward and 49 newtons pulling downward. What acceleration does the 5-kg mass undergo?
11.1 m/sec
2
-2.2 m/sec
2
17.4 m/sec
2
-6.1 m/sec
2
omit
Question 4
A 5-kg mass is being pulled towards the right with a rope that has a tension of 63 newtons at an angle of 37 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
7.6 m/sec
2
10.1 m/sec
2
2.5 m/sec
2
12.6 m/sec
2
omit
Question 5
A 18-gram bullet travelling at 50 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 37 centimeters, what average resistive force did the tree exert upon it?
-6.08 x 10
2
nts
-2.43 x 10
0
nts
-6.08 x 10
1
nts
-9 x 10
-1
nts
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