Guided Notes: Graphing Speed & Acceleration

CONSTANT SPEED

* If something is “constant” what does that mean?

* It does not ______What does the term ______speed mean? * Speed that does not change is ______speed.

* Name some things that you think have ______speed.

Average Speed

* Average ______is speed that changes or fluctuates.

* Most moving objects travel at average speed, * they start from a ______still, begin slowly, increase their ______, slow down, speed up, and eventually slow to a ______.

* On a distance-time graph ______speed would appear as a line that changes direction as it goes across the graph. It would be described as a ______line.

* A ______line indicates that motion is occurring. * A flat ______line indicates that motion has stopped but time ______.

Review

* You will recall from a previous lesson that Speed is calculated using the formula * s = d / t

* What is the average speed of a 18 wheeler driver who drives non-stop 1600 miles from Houston to Los Angeles in 23 hours? * S = d / t * S = ______. * S = ______mi/hr.

Acceleration

* In order to ______acceleration you must understand the difference in speed and velocity.

* Speed is how long it takes a ______object to travel a distance.

* Velocity is ______in a given direction.

* NOW, ______IS THE RATE OF CHANGE IN VELOCITY.

* You must ______that if either speed or direction changes, the object has ______acceleration. ______

Formula for CALCULATING ACCELERATION

acc = ______time for change to occur acc = ______t

* At the top of the hill the roller coaster is moving 20 m/sec and increases in speed to 40 m/sec at the bottom of the hill. It takes 4 seconds to reach the bottom of the hill.

* What is the roller’s coaster’s acceleration? acc = ______t ______4 sec acc = 5 m/s/s

* As it goes up the hill, it slows to 20 m/sec. The total time from the bottom of the hill to the top of the next hill is 5 seconds. What is the acceleration of the roller coaster? acc = ______t acc = ______5 seconds acc = ______

INTERPRETING A DISTANCE-TIME GRAPH Questions

* What kind of graph is this?

* Snail _____was fastest at the beginning of the race.

* The slowest at the beginning was snail ______.

* Which snail stopped during the race?______

* How long was it stopped?

* How far had snail A gone after 2 hours?

* Snail_____ got faster and faster as the race went on.

* After 4 hours Snail B had gone _____inches.

* It took snail C _____hours to cover 50 inches.

* Snails ____&____ traveled at constant speed.

* Snail_____ had the fastest constant speed.

* What was the average speed of snail C?

* (show your work below)

A few questions for you:

* What does the horizontal line for car C indicate?

* Which car(s) is/are accelerating? How do you know?

* Which car(s) is/are traveling at constant speed?

* Which car won the race?

* How do you know which car won the race?

* What is the average speed of each car in the race?

* 1.The graph used to graph speed is called a ______-______graph.

* 2. Speed that does not change is called ______speed. * 3. Speed that fluctuates is called ______speed.

* 4. The shape of a line on a distance-time graph for constant speed is a ______, ______line.

* 5. The > the slope the ______the constant speed.

* 6. On a distance time graph a line that is horizontal indicates ______.

* 7. The formula for calculating speed is ______=______

* 8. Speed in a given direction is called ______.

* 9. The rate of change in velocity is called______.