What is speed?
A way of describing “how fast” something is moving.
More technically, speed is the rate of change of an objects position with respect to time.
Calculation of Speed There are a couple of different ways to
calculate speed Average speed, S, is simply the change
in position, x, divided by the time, t, taken to travel that distance…
IF
IF
tt
xx
t
xS
Maximum Speed = 62 mph
Sample Problem: Speed A runner runs a
400 meter race in a time of 50 seconds.What is her average speed?
s
mS
tt
xxS
IF
IF
050
0400
smS 8
What is Acceleration?
A way of describing how fast something is speeding up or slowing down.
More technically, acceleration is the rate of change of an objects speed with respect to time.
Calculation of Acceleration As with speed, there are a couple of
different ways to calculate acceleration Average acceleration, a, is simply the
time rate of change of speed, S,…
IF
IF
tt
SS
t
Sa
Applications of Acceleration: Lamborghini
Accel. = 15.38 MPH/sec = 22.56 ft/sec^2Engine: 6 liter, V12
Horsepower: 550 @ 7100 RPMMaximum Speed: 210 MPH0-60: 3.9 sec0-100: 8.8 secPrice: $275,000
Applications of Acceleration: Space Shuttle Accel. = 64.87 MPH/sec = 95.14
ft/sec^2Speed Attained: > 17,500 MPHTime to Low Orbit: 11 min.Time to Space: 45 min.