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
?
2.1 x 10
1
nts
4.29 x 10
-1
nts
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 8 newtons towards the right experiences an acceleration of 0.14 m/sec
2
?
5 x 10
1
nts
8.16 x 10
0
nts
7 x 10
0
nts
9.8 x 10
-1
nts
omit
Question 3
A 7-kg mass experiences two vertical forces: 24.2 newtons pulling upward and 68.6 newtons pulling downward. What acceleration does the 7-kg mass undergo?
-6.3 m/sec
2
44.4 m/sec
2
13.3 m/sec
2
-37.4 m/sec
2
omit
Question 4
A 7-kg mass is being pulled towards the right with a rope that has a tension of 56 newtons at an angle of 32 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
4.2 m/sec
2
2.5 m/sec
2
8.0 m/sec
2
6.8 m/sec
2
omit
Question 5
A 16-gram bullet travelling at 60 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 32 centimeters, what average resistive force did the tree exert upon it?
-9.6 x 10
-1
nts
-9 x 10
1
nts
-3 x 10
0
nts
-9 x 10
2
nts
Copyright © 1997-2012
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton