What is the formula for calculating DISTANCE if given speed and time?
d = v * t
What is the formula for calculating SPEED if given time and distance?
v = d / t
A woman jogs 10 kilometers in one hour, stops at a restaurant for one hour, and then walks 10 kilometers in two hours. What is her average speed for the outing?
5 km/h
On a distance-time graph, what variable goes on the Y-axis?
Distance
What does the slope of a line on a distance-time graph represent?
speed
Lisa plotted time in seconds on the x-axis of a line graph and distance in centimeters on the y-axis. Her plot showed a straight line from (0,0) to (10, 20). What is the speed?
2 cm/s
What is a VECTOR?
Any quantity with both direction and magnitude!
On a distance-time graph, what variable goes on the X-axis?
time
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).
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)
How do speed and velocity differ?
speed is 'rate' of motion (distance traveled per time); velocity is speed and direction!
What is the formula for calculating TIME if given speed and distance?
t = d / v
What type of speed does an automobile's speedometer display?
instantaneous speed
On a distance-time graph, a DECREASING DIAGONAL LINE represents what type of motion?
constant speed toward the reference point
Define SPEED
ratio of the distance an object moves to the amount of time.
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)
On a distance-time graph, an INCREASING DIAGONAL LINE represents what type of motion?
constant speed away from reference point
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.
On a distance-time graph, a HORIZONTAL LINE represents what type of motion?
No motion (no change in distance over a period of time)
What are the SI units for SPEED?
meters/second (m/s)
A kayak is moving across a stream (at a right angle) that is flowing downstream at a velocity of 4 km/h. The kayak’s velocity is 3 km/h. What is the magnitude of the kayak’s velocity relative to the river bank?
5 km/h
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