What is the difference between Speed, Velocity and Acceleration? Could any one describe it pictorially?. I am more over confused even after investigating many times. I am unable to relate myself practically.
Answer
Speed has no direction while velocity does. For example, if I say that I'm running at 10 mph, I have given you my speed. If I say that I'm running 10 mph north, then I have given you my velocity. Acceleration is the rate of change in velocity. Imagine this: I am in my car and you look at me before I even press the gas pedal. You close your eyes then open them (imagine the blinking only took a second). Now, I'm going 10 mph north. You blink again. Now I'm going 20 mph north. Every second my velocity increased 10 mph north. This means my acceleration is 10 mph every second or 10 mi/h/s. 
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