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a

b

Figure 1.11

Regarding the second position b , there are three possible rotational

of motions of rigid body around fixed OX ,OY ,OZ, three degrees of
freedom. of rotational motion of rigid body .

1.7 Questions

1.What's the frame of reference.?

2.What are the methods of determination of point's position in space?
3. What's the displacement and trajectory of material point?
4. What's the difference between speed and velocity ?
5.What motion is called a uniform motion ?

6.Why instantaneous velocity is the first derivative of displacement
with respect to time?
7.What's acceleration and what's the unit of acceleration?

8.What characterizes normal acceleration?
9.What characterizes tangential acceleration?
10. What's the degrees of freedom of a rigid body?

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