# Mrs.popps

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• The speed of that bus is 0 mph. Speed is the distance an object travelsin a certain amount of time.
• Oh that's what speed is. Thanks for explaining it more to me.
• That bus is going 0 mph. Speed is the distance a object travels in a certain amount of time.
• Oh I always get velocity and acceleration mixed up. What's velocity?
• If this bus were to move that would be acceleration. Acceleration is the rate of change in velocity.
• Thanks for clearing that problem up for me. I have 2 more questions. What's scalar, vector and the Doppler shift?
• I get velocity and acceleration mixed up to. Velocity is the speed of an object , but the direction is also included. EX: 12 mph North
• That's what scalar is. I thought that was vector is but you proved me wrong. What's vector?
• Scalar and Vector are similar but different at the same time. Scalar is quantities that are fully described by a magnitude alone.
• Thank you so much for clearing up all these questions I had. This bus sounds like it's going to accelerate and leave.
• Vector is a quantity that are fully described by both a magnitude and a direction. The Doppler shift is a change in frequency due to the Doppler effect.