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Define SPEED
ratio of the distance an object moves to the amount of time.
What are the SI units for SPEED?
meters/second (m/s)
How is instantaneous speed different from average speed?
instantaneous speed is measured at a particular moment in time; average speed is for the duration of a 'trip' (total distance/total time).
What is the formula for calculating SPEED if given time and distance?
v = d / t
TRUE or FALSE: You can determine how fast you are going at the midpoint of a trip by calculating the average speed for the entire trip.
FALSE - average speed is for entire trip (would need more info for instantaneous speed at the midpoint of trip)
A student walked 1.5 km in 25 minutes and then, realizing he was late, ran the remaining 0.5 km in 5 minutes. Calculate the average speed on the way to school and express your final answer in km/h (kilometers/hour).
0.067 km/min (or 4.0 km/h)
What type of speed does an automobile's speedometer display?
instantaneous speed
What does the slope of a line on a distance-time graph represent?
speed
How do speed and velocity differ?
speed is 'rate' of motion (distance traveled per time); velocity is speed and direction!
TRUE or FALSE: if a car travels around a gentle curve on a highway at 60 km/h, the velocity does not change.
FALSE - even at a constant speed, if direction changes then the object's velocity is changing.
What is the formula for calculating TIME if given speed and distance?
t = d / v
What is the formula for calculating DISTANCE if given speed and time?
d = v * t
On a distance-time graph, a HORIZONTAL LINE represents what type of motion?
No motion (no change in distance over a period of time)
On a distance-time graph, an INCREASING DIAGONAL LINE represents what type of motion?
constant speed away from reference point
On a distance-time graph, a DECREASING DIAGONAL LINE represents what type of motion?
constant speed toward the reference point
On a distance-time graph, what variable goes on the Y-axis?
Distance
