2.1.4 Grade 9 - Motion Flashcards

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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.

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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.

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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

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