speeding up 2 (final)
DESCRIPTION
year 9TRANSCRIPT
Learning Question• Would Usain Bolt the 100m record
holder, be able to outrun a cheetah?
http://news.bbc.co.uk/sport1/hi/athletics/8204381.stm
Distance, Time and Speed To work out the speed of an object you need to know: • the distance traveled• how long it took to travel that distance
Use this equation:
SPEED = distance
timeSpeed is measured in many
different units, e.g. m/s, km/h, km/s, miles per hour.
The units of distance and time used will give the units to be used
for speed.
d
s x t
Formula triangle
Formula triangle
Distance (km) = Speed (km/h) x time (h)
= 3.6 km/h x 2 h = 7.2 km
Questions1. A group set off from home and walk at an average speed of 3.6 km/h. How far would they travel in 2 hours? Give your answer in km.
d
s x t
Click for solution
Would you survive a safari?Different animals run at different speeds, we are going to see if we would be able to beat them.
Elephant 11m/s
Zebra 18m/s
Cheetah 31m/s
Squirrel 5m/s
Pig 4.5m/s
0.013m/s
http://www.youtube.com/watch?v=4QZPXEhP_Sw
So would Usain Bolt be able to outrun a
cheetah?
Usain Bolt ran the 100m in
9.58 seconds! Could he
outrun the cheetah?
Cheetah’s Speed = 31m/s