Speed and Velocity
What is the formula for speed?
Speed = Distance ÷ Time
On a distance-time graph, what does a horizontal line mean?
The object is not moving (speed = 0).
What is a reference point?
A place or object used to determine if something is in motion.
What does it mean if an object speeds up, slows down, or changes direction?
It is accelerating.
What is the SI unit for speed?
m/s
You travel 200 km in 2 hours. What is your speed?
100 km/h
On a speed-time graph, a straight horizontal line shows what?
Constant speed
If a car passes another going the opposite direction at the same speed, do they have the same velocity?
No, because their directions are different.
What is the formula for acceleration?
(Final speed – Initial speed) ÷ Time
A swimmer swims 20 m in 40 s. What is their average speed?
0.5 m/s
When an object is at rest, what is its speed?
0 m/s
If a speed-time graph shows a line sloping upward, what does that mean?
The object is accelerating (speed increasing).
What is displacement?
The difference between an object’s starting and final position.
A bunny goes from 80 m/s to 20 m/s in 0.5 s. What is its acceleration?
-120 m/s²
If a storm is moving 15 km/h north, what quantity is being described?
Velocity
What two things do you need to know to describe velocity?
Speed and direction
During which time interval was the object moving fastest on a distance-time graph?
The steepest part of the line
If you ride your bike around the block and return to where you started, what is your displacement?
0
On a speed-time graph, what does a downward-sloping line mean?
The object is slowing down (negative acceleration).
What are two things needed to determine an object’s position?
Distance and reference point
A car travels 10 km East in 0.2 h. What is its velocity?
50 km/h East
On a distance-time graph, if the line curves upward, what does that show?
The object’s speed is increasing over time.
Which of these is the most specific direction: “25 km Southwest” or “across the river 5 feet”?
25 km Southwest
Give one real-life example of acceleration.
(ex: a car turning, roller coaster speeding up, etc.).
A dog runs 120 m at an average speed of 2 m/s. How long did it take?
60 seconds