But…Fastest land animal: cheetah
(70 mph, 113 km/h)
Fastest sea animal: sailfish (up to 68 mph, 110 km/h)
Usain Bolt• World Record holder
• 100m = 9.58 sec (38 km/h, 23 mph)http://www.youtube.com/watch?v=3nbjhpcZ9_g
• Bugatti Veyron: 267 mph (441 km/h)• 0-60 in 2.5 secs • $1,700,000 (US)
299,792 kilometers per second = 1,079,251,200 km/hr !!!186,287 miles per second = 670, 633,200 mph
• A traveler, moving at the speed of light, would circumnavigate the equator approximately 7.5 times in one second. By comparison, a traveler in a jet aircraft, moving at a ground speed of 500 mph, would cross JUST the continental U.S. once in 4 hours.
• It takes 499.0 seconds (8 min) for light to travel from the Sun to the Earth
• Average 1.25 centimeters or 0.5 inches per month
• 15 centimeters or 6 inches per year
• Depends on age and health
http://alt.coxnewsweb.com/ajc/swf/blueangels/blueangels.swf
SPEEDBack seat of an F-18
Yes, All things are in motion.
• You may be perfectly still yet the earth is spinning on its axis and orbiting the sun.
• The sun orbits the center of the galaxy, our galaxy and Andromeda are moving toward one another, most of the other galaxies are moving away.
So to measure motion in a meaningful way, we measure it relative to the observer or another object we consider not to be moving.
When you pass a car on the highway moving in the same direction, you may be going 70mph, and the other car 65mph. But your speed relative to the other car is 5mph.
When the shuttle docks with the space station the two orbiting objects approach one another at a very slow speed relative to one another, but both are orbiting at 17,000mph relative to the surface of the earth.
•Motion is a change in position relative to your surroundings.
•An object moves when it speeds up, slows down or changes direction.
Main IDEAS
SPEED IS….
Inversely Inversely Proportional toProportional to TIMETIME
Greater speed, less time
Less speed, more time
An ant crawled 12 inches in 10 seconds. A second ant crawled 24 inches in 10 seconds.
Compare the speed of the ants.
A plane flew 220 meters in 1 second.
A second plane flew 220 meters in 2 seconds.
Compare their speeds.
STEPS IN PROBLEM SOLVING
STEP 1. Write the formula
STEP 2. Substitute given numbers and units STEP 3. Solve for the
unknown.
SAMPLE PROBLEMS:1. A car travels 240 kilometers in
3 hours. What is the speed of the car during that time?
ANSWER: S= d/t S= 240 km/3 hr
80 Km/Hr
The speed of a cruise ship is 50 km/hr. How far will the ship travel in 14 hours?
Answer: D = ST 700 km
A car travels 200 m in 10 seconds. What is the average speed of the car?
ANSWER: Ave speed= total d/total time
= 200m/10s
20 m/s
Definitions:
A change in position in a certain amount of time is __________.
__________________ is the rate at which an object moves and is determined by dividing ____________ by _____________.
_________________________ is speed that does not change.
_________________________ is calculated by dividing the total distance by the total time.