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 7-kg mass if it is accelerating at a rate of 3 m/sec
^{2}
?
1 x 10
^{1}
nts
4.29 x 10
^{-1}
nts
2.1 x 10
^{1}
nts
0 nts
omit
Question 2
What is the magnitude of the frictional force present if a 7-kg mass being pulled by a horizontal force of 6 newtons towards the right experiences an acceleration of -0.14 m/sec
^{2}
?
6.12 x 10
^{0}
nts
9.8 x 10
^{-1}
nts
7 x 10
^{0}
nts
5 x 10
^{1}
nts
omit
Question 3
A 7-kg mass experiences two vertical forces: 32.3 newtons pulling upward and 68.6 newtons pulling downward. What acceleration does the 7-kg mass undergo?
-5.2 m/sec
^{2}
-29.3 m/sec
^{2}
36.3 m/sec
^{2}
14.4 m/sec
^{2}
omit
Question 4
A 7-kg mass is being pulled towards the right with a rope that has a tension of 42 newtons at an angle of 37 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
3.6 m/sec
^{2}
4.8 m/sec
^{2}
6.0 m/sec
^{2}
1.2 m/sec
^{2}
omit
Question 5
A 12-gram bullet travelling at 40 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?
-1.3 x 10
^{0}
nts
-4.8 x 10
^{-1}
nts
-2.59 x 10
^{2}
nts
-2.59 x 10
^{1}
nts
Copyright © 1997-2018
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton