Engineering Mechanics Practice Test 10

1. We need to apply vector math sometimes in the calculation of the stability of equilibrium configurations. So the coordinate of the Force vector AB is A (2, 0, 2) and B (-2, 3.46, 3). It has a magnitude of 750N. Which is the best Cartesian representation of the vector AB?

2. What is the sum of squares of the cosine angles made by the conservative force vector with the coordinate axis?

3. The net moment of the body is zero that means the work done by the force and the rotational axis is zero.

4. In the explanation of the theory of friction over which conservative forces were acted upon, the block used to have an assumption. That is the upper portion of the block is considered to be rigid.

5. What is not the condition for the equilibrium in three dimensional system of axis so as to calculate the unknown forces acting on the body?

6. The net forces of acting on the body need to be zero. This is also applicable for the bodies having some potential energy. This means that the work done over it is saved in the form of potential energy.

7. Work done is best given by___________

8. We first make equilibrium equations of the body by considering all the three dimensional forces and then the free body diagram is made and solved. Thus the criteria for the potential energy equilibrium.

9. Potential energy is stored in the body if some work is done on it. Work done is best given by:

10. If the resolved force or the force which you get as the answer after solving the question is negative, then what does this implies?