Velocity

1
Velocity Acceleration
Scalar
Example 65 miles / hour
( )
Vector
Example 65 miles / hour, north
( )
Velocity how fast something is moving,
_________________
Acceleration
Does the moon accelerate?
Change acceleration in a car, how?
1)
2)
3)
2
Velocity Acceleration
Scalar
just magnitude (the number)
Example 65 miles / hour
(speed)
Vector
magnitude and direction
Example 65 miles / hour, north
(velocity)
Velocity how fast something is moving,
with direction.
Acceleration
is the change in velocity!
YES!
The velocity is constant, but direction is always
changing!
Does the moon accelerate?
Change acceleration in a car, how?
1)
Accelerator gas pedal
2)
Brake
3)
Steering Wheel
3
ACCELERATION is
a
a
Example A car driving 20mph speeds up to 50mph
in 15 seconds, what is its acceleration?
a
a
a
4
ACCELERATION is
change in velocity time
a
Vf velocity final Vi velocity initial t
time
Vf - Vi t
a
Example A car driving 20mph speeds up to 50mph
in 15 seconds, what is its acceleration?
Vf - Vi t
a
50mph - 20mph 15 sec
a
30mph 15 sec
2miles/hour/sec
a