Motion of PointMass Objects


Q: At what point in the path of a projectile is the speed a minimum? A: The speed of the projectile is at a minimum when the projectile has reached its highest point. This is because the projectile only has horizontal speed, the vertical speed has gone to zero and is about to reverse direction.

Q: At what point in the path of a projectile is the speed a maximum? A: The projectile has its maximum speed at the lowest point along its path. Here the projectile not only has its horizontal velocity but also has a maximum vertical velocity, downwards.

[Top] [Previously Asked Questions] [References]
Position vector  r = xi + yj + zk 
Displacement  r = r_{2}  r_{1} r = (x_{2}  x_{1})i + (y_{2} y_{1})j + (z_{2} z_{1})k 
Average velocity  
Velocity  v = v_{x} i + v_{y} j + v_{z} k 
Average acceleration  
Acceleration  a = a_{x} i + a_{y} j + a_{z} k 
Projectile motion  x  x_{0}
= (v_{0} cos _{0}
) t
y  y_{0} = (v_{0} sin _{ 0}) t  gt^{2} v_{y} = v_{0} sin _{ 0}  gt 
Path of a particle in projectile motion  
Range of a particle in projectile motion  
Uniform circular motion  
Time for a particle in in uniform circular motion to complete a circle  
Relative motion  v_{PA}
= v_{PB }+ v_{BA} a_{PA} = a_{PB} 
[Top] [Previously Asked Questions] [References]
ครั้งที่
เรื่องการทดลองเสมือนจริง