Speed Racer
This is the distance traveled over time
What is speed?
Sketch a distance v. time graph that shows an object traveling at a constant velocity.
Single continuous line that doesn't change angles or directions
This is the total path traveled.
What is distance?
Change in the position of an object, over elapsed time
What is velocity?
Sam takes a trip to the bathroom, which is 60 meters away. It takes her 6 minutes to return. What is her average speed?
20 m/min or 0.33 m/s
How fast you are going plus your direction.
What is velocity?
This part of a distance v. time graph denotes the velocity.
What is the slope?
This measure of position can only be positive.
What is distance?
Moving in these two directions result in a negative velocity
left and down OR west and south
A swimmer travels at 0.8 m/s heading south across a small lake. At the same time, a second swimmer heads north from the opposite shore at a speed of 0.4 m/s. How wide is the lake if the two swimmers meet 12 min later?
864 m
What is the average speed of a cow that walks east 60 meters in 90 seconds?
0.7 m/s
Sketch a distance/time graph of a person running fast to the store, resting, and then walking back home.
Steep slope upwards, flat rest then gentle slope up
This is a change in position, or how far you are from the starting point.
What is displacement?
Convert 100 km/hr to m/s
27.78 m/s
With their backs touching about to square off, Kasey and Bianca start walking away from each other at a pace of 2 steps per second for ten seconds. How far apart are they after 12 seconds?
40 steps
This means that an object traveled equal distance in equal time.
What is constant speed?
Draw a velocity/ time graph for a person who walks slowly toward home, then stops, then runs toward home.
will vary
It takes Lisa 3 minutes to walk 150 m from Cato II to Cato I. When she gets there she realizes that she left her phone in Dr. High's classroom, and runs back to Cato II at a speed of 2 m/s. What is Lisa's average velocity?
zero
A submarine must reach a marker 290 km from shore 9 hr after leaving port. At what time will the submarine pass a marker that is 125 km from shore?
3.88 hr or 3 hr and 52 min
A sprinter running at 9 m/s is chasing a long distance runner who runs at 7 m/s. The long distance runner starts 200 m ahead. The sprinter, however, can only run for 2 min without stopping. Does the sprinter catch the distance runner?
Yes.
Sprinter runs 1080 m
Distance runner is 1040 m
What is the speed of an object moving east for 6 seconds at 105.3 m/s?
105.3 m/s
Two bicyclists approach each other on the same road. One has a speed of 5.0 m/s and the other has a speed of 8.0 m/s. They are 500 meters apart. How long will it be before they meet?
38.5 m/s
An object changes its position by 50 meters, traveling at a speed of 15 meters every second. How much time has passed?
3.3 seconds
A tennis ball is moving 30 m/s toward a player who swings a racquet at a velocity of 15 m/s toward the ball. What is the velocity of the ball relative to the racquet?
84 m/s
A car leaves a city traveling at a constant speed of 85 km/hr on a straight road. A second car leaves exactly one hour later traveling in the same direction. At what speed must the second car travel to catch up with the first car 250 km away from the city?
128.8 km/hr