Equation for Average Velocity
<V> = ΔX/Δt
Difference between speed and velocity
- Velocity is a vector; it has a magnitude and direction
- Speed is does not have a direction
- Velocity is a measure of displacement/time
- Speed is a measure of distance/time
Equation for acceleration
- a = ΔV/Δt
- *must be instantaneous velocity
- *constant velocity means zero acceleration
Relationship between position, velocity, and time for one-dimentional motion
- x = x0+v0t+1/2at2
- v2-v02 = 2aΔx
- v = v0+at
Define acceleration, velocity, and deceleration
- Acceleration: How quickly the velocity changes
- Velocity: How quickly the position changes (net)
- Deceleration: Acceleration is in the opposite direction of velocity
If you throw a ball straight into the air...
How does acceleration apply?
How does velocity apply?
- Acceleration is g at EVERY POINT in the throw, even at the top.
- Velocity is equivalent at the same point (y) during the throw, but will have the opposite direction (opposite sign)
- Velocity at the top will be 0