The Insanity Begins!!! (dum dum dum)Mr. Fox’s Science Class

MotionSomething is in motion when its distance

from another object is changing.But that doesn’t mean it’s constantly moving

(OMG WHAT?)

Reference Point – place or object used for comparison to determine if something is in motion.

You are in motion if your distance is changing relative to a reference point.

Has your brain exploded yet?What does that all mean? (you don’t have to

write this.) Does it hurt?

Don’t ForgetWe measure using the metric system.

Distance is measured in metersTime is measured in seconds, minutes, or

hours.

Naked Number are now wrong answers! No label on a number, no credit for the work!

Speed!!The distance of an object travels in one unit

of time.

Unit = m/s km/h cm/s….. etc.

ExamplesA horse travels 21 meters in 3 seconds. How

fast is the horse traveling? A car drives on the Thruway from Kingston to

Albany in about 64 minutes. It travels about 78.875 km. How fast was the car traveling?

A car is traveling at 72.34 km/h for 4 hours. How far did the car travel?

Michael Johnson is one of the fastest men on Earth with an average speed of 10.325 m/s. How long would it take him to run 200 m?

Average SpeedIt is done a little different.

A cyclist travels 32 km during the first 2 hours, and then 13 km for the next hour. What is the average speed.

I hardly ask these.

VelocityThe speed and direction of an object’s

motion.

Speed in a given direction! You don’t know an objects velocity if you don’t know the direction!

Tough One: If a person runs around a track, that is 1,000 meters (the track is round.) in 100 seconds, what is the runners velocity?

AccelerationThe rate at which velocity changes.

Acceleration is increasing speed, decreasing speed, or changing direction.

Decreasing speed = - (negative) acceleration! (it is possible!!!!!)

Acceleration Formula

Units: m/s/s or m/s2

Practice questionsA car is running around the track at a slow

speed of 96km/h. The green flag for the race drops and the car speeds up to 321km/h in about 25seconds. What is the cars acceleration?

A train needs to slow down to make stop for the station. The train is traveling at 150km/h. It will take the train 0.083 hours to stop. What is the trains acceleration?

Gravity? Acceleration due to gravity is 9.80665 m/s2

(approx. 32.174 ft/s2 at sea level!)Meaning that if you were to kick Mr. Fox out

of a plane, he would keep falling 9.8o665 m/s faster every second!

1 second speed equals 9.80665, 2 seconds twice that, 3 seconds… well you don’t want to think about it.

More PracticeA plane taking off from Newark airport goes from

resting to 268.224 m/s in 300 seconds. What is the planes acceleration?

That same plane flies from Newark to LAX. It flies a total of 3918.66km in 6 hours. What was the speed of the plane?

A fight breaks out in the plane between CC and Mr. Fox. CC is able to throw Mr. Fox out of the plane. Mr. Fox reaches a speed of 274m/s while falling. He hits the ground in 30 seconds. What is his acceleration?