1.2 - Velocity and acceleration Flashcards
1
Q
What is the velocity of an object?
A
Its speed in a given direction
2
Q
How can an object accelerate while moving at a steady speed?
A
By changing direction
3
Q
What happens to the velocity of an object if its changes direction?
A
It changes, even if the speed stays the same
4
Q
What do we call it when the velocity of an object changes?
A
We say it accelerates
5
Q
In a = v-u/t, what does each letter represent and what is the unit?
A
- a is acceleration in metres per second squared, m/s^2
- v is final velocity in metres per second, m/s
- u is initial velocity in metres per second, m/s
- t is time taken for change in seconds, s
6
Q
What is the SI unit of acceleration?
A
Metres per second squared
7
Q
What is the SI unit of velocity?
A
Metres per second
8
Q
What is deceleration?
A
Negative acceleration - when the value calculated for acceleration is negative
9
Q
What is the velocity of a runner doing a lap around a circular track?
A
Zero metres per second (the overall direction does not change)
