Motion Flashcards
Define “motion”.
The change in position.
Choose the correct answer.
Speed is:
A. Faster than light.
B. Change in position.
C. The rate at which an object covers distance.
D. Usain Bolt.
C. The rate at which an object covers distance.
What is the SI unit for speed?
m/s.
Speed is a scalar/vector.
Scalar.
How do we calculate average speed?
Average speed = total distance / total time
A straight, upward-sloping line means the object is travelling at a _____, ______ speed.
- Steady.
2. Constant.
If the line is horizontal, the object is _________.
Stationary.
If the line is steeper/curving upwards, the object is moving ______.
Faster.
If it curves downwards, it is moving ________.
Backwards.
Define “acceleration”.
The rate at which speed changes.
How do we calculate acceleration?
Acceleration = change in speed / change in time.
What do we need in order to calculate acceleration?
- The initial speed.
- The final speed.
- The time it took for the change in speed.
What is the SI unit for acceleration?
m/s2.
Meters per second per second.
Define “deceleration”.
When the change in speed is negative, which means the objects speed is decreasing, the acceleration will be negative.
If the object is slowing down, the acceleration is _______ and ________.
- Negative.
2. Decreasing.
