acceleration and velocity kinematics

[mastepfxg]

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Hi guys,

I was thinking if someone could help me understand the following concepts

Why does an object's speed increase when acceleration(a) is in the same direction as velocity(v)?
When a is perpendicular to v why is the object's speed constant?
Why does an object's speed decrease when a is in opposite direction of v.?
Why is it that when a is between zero degrees to 90 degrees to v, objects speed increase and the direction of v changes?
lastly Why does an object's speed decrease and the direction of v changes when a is at an angle between 90 to 180 to v.

Thanks!

 

[DrknoSDN]

These questions the fundamentals of kinematics and motion. If you have not completed your physics course and are already studying I would highly suggest you take a few hours and watch the full series of khanacademy physics videos covering One and two dimensional motion. Those videos should answer all the questions you presented, and probably some more you didn't even know you had. 🙂

Link here:
https://www.khanacademy.org/science/physics