2.1.4 Grade 9 - Motion Flashcards
1
Q
If a velocity-time graph consists of one straight line in the downwards direction, what is true about the motion?
A
The object is decelerating at a constant rate.
The object is travelling at a non-constant velocity.
2
Q
What is acceleration?
[4]
A
An object’s acceleration is equal to its change in velocity divided by the time taken to change its velocity.
The units of acceleration are metres per second squared, ms-2.
Deceleration is a negative acceleration. This is due to a decreasing velocity.
3
Q
If an object is initially travelling at a velocity of 6 ms-1, then decelerates for 2 seconds, at which point its velocity is 2 ms-1, what is the acceleration of the object?
A
-2 ms-2
