Take home test 2- Statics- Spring 08- S. Nasseri

1.         The resultant of two forces of equal value is

a)  Always zero

b)  Never zero

c)  Zero only if the two forces point in exactly opposite direction.

2.         You have two forces which are 500 N and 800 N strong, respectively. The resultant of these two forces is

a)  Always equal to 1300 N

b)  At most 1300 N

c)  Always less than 1300 N

3.         In order for a particle to remain at rest, the resultant of

a)  all forces

b)  most forces

c)  two of the forces

acting on the particle has to be zero.

4.         In order to find the resultant of three forces, say F1, F2, and F3, you MUST first determine the resultant of:

a)  F1 and F2

b)  F1 and F3

c)  F2 and F3

and then add the third force. Or :

d)   the choice with which two forces you start is arbitrary.

5.         In order to determine the resultant of two forces it is sufficient to know :

a)  the value of both forces

b)  the angle between the two forces

c)  all of the above

6.         If the x-component of a force is equal to zero

a)  the y-component is also zero

b)  the z-component is also zero

c)  cannot tell

d)  neither y- nor z-component is zero

7.         The magnitude of a force

a)  is always positive

b)  is never negative

c) can be negative, zero, or positive

8.         the value of the component of a force

a)  is always positive

b)  is never negative

c)  can be negative, zero, or positive

9.         The value of a force component is always smaller or at best equal to the magnitude of that force.

a) true

b) false

10.       If you want to calculate the magnitude of the resultant of several forces using components you must align the x-axis of your coordinate system

a) with the North-South direction

b) with the bottom rim of your page

c) can choose arbitrarily

11.       The magnitude of a force is only zero if each of its components is zero

a) true

b) false

12.       In an orthogonal coordinate system

a) the axes are mutually perpendicular

b) the axes are always called x and y (and z)

c) the angle between axes is arbitrary