Terms/Vocabulary
The total path taken is called?
Distance
A runner covers 1,200 meters in 4 minutes. What is the runner's speed in m/s?
Answer: 5 m/s
4 minutes = 240 seconds
Speed = 1200/240 = 5 m/s
A track is 100 meters around. If a runner runs halfway around the track, his distance traveled would be____________?
50 meters
A car travels 60 km in 2 hours. What is its speed?
Answer: 30 km/h
v = d/t = 60 km/2h
What formula do you use to find momentum
p = m x v
An indication of which way the object has moved or is moving is called.
Direction
A skateboarder increases their velocity from 2 m/s to 8 m/s in 3 seconds. What is their acceleration?
Answer: 2 m/s^2
Δv = 8 - 2 = 6 m/s
a = Δv / Δt = 6/3 = 2 m/s^2
A student walks 6 meters east, then turns around and walks 4 meters west. What is the student's total distance traveled, and what is the displacement
Distance: 10 m
Displacement: 2 m west
A cyclist travels 45 km in 1.5 hours. What is their speed in km/h?
Answer:30 km/h
v = d/t = 45 km/1.5 h = 30 km/h
"Δx = Δxf - Δxi" is what formula?
Displacement
The length of shortest path from start to finish
displacement
A car drives 150 km in 3 hours, then drives another 100 km in 2 hours. What is its average speed for the entire trip?
Answer: 50 km/h
Total distance = 150 + 100 = 250 km
Total time = 3 + 2 = 5 hours
Average speed= 250 / 5 = 50 km/h
Abby walked 2 blocks north, 2 blocks east, 2 blocks west, and then 2 blocks south. What was her displacement?
0 blocks
Answer: 80 km/h
v = d/t = 120 km/1.5 h = 80 km/h
What is the formula used to calculate acceleration?
a = Δv/Δt
The rate at which an object changes its velocity over time is called?
Acceleration
A car slows down from 30 m/s to 10 m/s in 4 seconds. What is the acceleration? (Hint: slowing down = negative acceleration)
Answer: -5 m/s^2
Δv = 10 - 30= -20 m/s
a = -20 / 4 = -5m/s^2
In a football game, a ball is placed on the line of scrimmage. The QB drops back 2 yards. He then throws the ball 15 yards forward to a WR. The ball is carried an additional 6 yards by the WR. What is the distance the ball traveled?
23 yards
A running back runs a total distance of 35 m in 4 seconds. However, his displacement from start to finish is 30 meters. What was his velocity?
7.5 m/s
Name one standard (metric) unit used for velocity.
m/s, or km/hr
The amount of motion an object has because of its mass and speed is called what?
Momentum
A plane is rolling down the runway at 15 m/s. It accelerates for 8 seconds until it reaches a takeoff speed of 47 m/s. What is the plane's acceleration?
Answer: 4 m/s^2
Δv = 47 - 15 = 32 m/s
a = Δv / Δt = 32 / 8 = 4 m/s^2
Jamil drove his car 4 miles north, 12 miles west, 6 miles north, 20 miles south, 16 miles east, and 4 miles west. What was his displacement?
10 miles south
A woman runs a marathon (40.56 km) in 4.6 hours. She finishes the race back at her starting point. What is her average velocity for the race?
0 km/hr
Name two standard units used for displacement
km, m, cm, mm