Calculating Average Speed
Frank's car travels 300 cm in 1.5 seconds. Calculate his average speed.
His car's average speed was 200 cm/second.
The point from which we observe motion?
Frame of reference
Hopping only 1 time to get my average time is NOT OK. Why?
More trials is much more accurate
Define motion.
Motion is the change of position over time relative to a reference point.
43 mph is a statement of...
Speed
Noah's car rolled 360 cm in 2 seconds.
Noah's car rolled 180 cm/sec.
If a car averaged 50 mph over several hours, it probably didn't go 50 mph the whole time. If it did though, it is said to have what type of motion?
Uniform
How long was the rope we used?
3 M long
What is acceleration?
Acceleration is the rate at which velocity changes over time.
3 inches upward is a statement of...
Velocity
Ellie hopped 27 feet in 5 seconds. What is her average speed?
Ellie hopped 5.4 ft/s
A student hopped fast and slow as she went around the rope on the ground. What type of motion is this?
Non-uniform
If the rope was only 3 M long then why did we write the distance down as 6 M?
Because we hopped down the 3 M rope then all the way back so that is another 3 M.
Complete the following equations: Average speed = _______ Time = ________ Distance =
Average speed = distance/time Time = distance/average speed Distance = time • average speed
A _________________ is a push or a pull.
Force
A plane travels 3,546 miles 9 hours. What is the plane's average speed?
394 mph
True of False...A child on a moving train holding an ice cream cone thinks that the cone is NOT moving. They are right for thinking this.
True (they are unaware of the movement so from their point of reference they are correct)
If someone had a higher number for their average speed, does that mean that they were fastest?
Yes!
What is the difference between speed and velocity?
Velocity includes average speed and direction, while speed does not include direction.
Acceleration is any change in motion. It means that velocity could change in these 3 ways...
speed up, slow down, turn
What is the difference between speed and velocity?
speed is just how fast where velocity is how fast AND what direction.
Why was it important to get 3 trial hops during our activity as compared to just 1 trial?
The more trials you do the more accurate the results.
An object's resistance to a change in motion?
Inertia