Marvelous Motion
This is calculated when you take the total distance traveled and divide by the total time.
Average speed
Kim travels 100 miles in 2 hours. What is her average speed?
50 mi/hr
What does it mean if an object has a negative acceleration?
It is slowing down
What does the slope on a velocity vs. time graph tell you?
Acceleration
A fast turtle moving at a speed of 0.1 m/s can travel very far in 15 seconds. Determine how far.
1.5 m
This describes an object’s speed and direction
Velocity
A car travels 600 mi at a constant speed of 50 mi/hr. How long did the trip take?
12 hrs
A bus traveling 12 m/s comes to a stop after 6 seconds. What was its acceleration?
-2 m/s2
Describe a distance vs. time graph of an object that is not moving.
Straight, horizontal line
If a go-cart slows down from a speed of 7 m/s to 2 m/s in 1 s, what is its acceleration?
-5 m/s2
The slope on a distance vs. time graph tells you
Speed
Rate of change in velocity is known as
Acceleration
A skier is going downhill at a speed of 9 m/s. The hill gets steeper and his speed increases to 18 m/s in 3 s. What is his acceleration?
3 m/s2
Describe a distance vs. time graph of an object that is moving at a constant speed.
Straight, diagonal line
The speed that shows up on the speedometer on a car is known as what?
Instantaneous speed
A porcupine moved toward a pond at a speed of 5 m/s. It took him 8 seconds. What was the distance he traveled?
40 meters
Find the velocity of a truck that travels 250 miles North to NYC in 5 hours.
50 mi/hr North
What is the acceleration of an object with a constant velocity?
0
Describe the difference between how a distance vs. time and a velocity vs. time graph show an object that is speeding up.
Distance vs time = curved line upwards ( J-shaped )
Velocity vs time = straight line upwards
What does a flat line on a velocity vs. time graph mean?
The object is moving at a constant speed.
A runner jogs 60 m on a track towards the finish line, then turns and runs back 20 m. What is her distance and her displacement?
Distance = 80 m
Displacement = 40 m towards the finish line
How is it possible to have a constant speed but a changing velocity?
Change in direction
A babysitter is pushing a stroller from rest and accelerates at a rate of 0.05 m/s2. What is the velocity of the stroller after it has traveled for 100 s?
5 m/s
Draw the difference between how a distance vs. time and a velocity vs. time graph show an object that is slowing down.
Distance vs time = flattening curved line
Velocity vs time = straight line downwards
Kerrigan rides her bike 12 blocks north and then turns and rides 5 blocks east. What is her distance and displacement?
Distance = 17 blocks
Displacement = 13 blocks NE