Distance, Speed and acceleration Flashcards
What is meant by the definition “Velocity”?
An instantaneous speed in a particular direction.
What is meant by the definition “Reaction Time”?
The time taken to react to a stimulus.
What is meant by the definition “Thinking distance”?
The distance travelled whilst reacting.
What is meant by the definition “Braking distance”?
The distance travelled whilst braking and going to a stop.
Why is speed a scalar quantity?
It only has magnitude (size).
Why is velocity a vector quantity?
It has a direction as well as a magnitude.
How do you find speed?
Speed = Distance
————–
Time
How do you find acceleration/deceleration?
Acceleration/Deceleration = Change in velocity/Time
What is speed measured in?
m/s
What is velocity measured in?
m/s²
What is the meaning of a constantly increasing gradient in a distance - time graph?
A constant speed and velocity
What is the meaning of zero gradient in a distance - time graph?
Zero speed so its stationary
What is the meaning of an increasing gradient in a distance - time graph?
An increasing speed so it is accelerating
What is the meaning of a decreasing gradient in a distance - time graph?
A decreasing speed so its decelerating
What is the meaning of a constantly increasing gradient in a velocity- time graph?
Accelerating constantly
