Questions in [ motion in two dimensions ]

[mo3az]

questions in [ motion in two dimensions ]

q. [ .. if you know the position vectors of a particle at two points along its path and also know the time interval during which it moved from one point to the other m can you determine the particle's instananeous velocity ? its average velocity ? Explain.


q. [.. a projectile is launched at some angle to the horizontal with some initial speed vi and air resistance is negligible . is the projectile a freely falling body ? what is its acceleration in the vertical direction ? what is its acceleration in the horizontal direction ?


q. [ ..O stat which of the following quantities , if any , remain constant as a projectile moves through its parabolic trajectory :(a) speed (b) acceleration (c) horizontal compnent of velocity (d) vertical component of velocity .

 

[superdave]

Think about it a little.

1) Instantaneous velocity is it's velocity at any given point right at that instant. Average is it's velocity over some distance for some amount of time.

2) If you throw a ball, after you throw it, what forces are acting on it? And what direction do those forces pull? there is no acceleration without a force.

3) You need to look at each of those quantities and think about what happens to a ball when thrown. Remember, after the ball leaves your hand, only certain forces are working on it. Acceleration will only change due to a force. Velocity will only change due to an acceleration.

 

[mo3az]

Thank u a lot ,,