
1 . 

Dynamics is concerned with bodies that only have accelerated motion.


2 . 

A particle has a mass but negligible size and shape.


3 . 

Some objects can be considered as particles provided motion of the body is characterized by motion of its mass center and any rotation of the body can be neglected.


4 . 

The distance the particle travels is a vector quantity.


5 . 

The average velocity of a particle is different than its average speed.


6 . 

If the acceleration is zero, the particle cannot move.


7 . 

A position vector r acting along a straight axis s, can never change direction.


8 . 

A position vector r acting along a straight axis s can change its magnitude and sense of direction.


9 . 

Kinematics is concerned with the forces that cause the motion.


10 . 

Speed represents the magnitude of velocity.


11 . 

Average speed represents the total distance traveled divided by the total time.


12 . 

A particle can have an acceleration and yet have zero velocity.


13 . 

The equation v = v_{0} + a_{c}t can be used when a = (3 t) m/s^{2}.


14 . 

For rectilinear kinematics, the direction of v is defined by its algebraic sign.


15 . 

For rectilinear kinematics, the positive direction of the coordinate axis can be directed to the left.


16 . 

If v = (4 t^{3}) m/s, it is necessary to know the position of the particle at a given instant in order to determine the position of the particle at another instant.


