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What’s In
In Grade 7, you learned displacement, velocity, and acceleration. You
conducted activities wherein you understood and made visual representations of
the motion of objects such as motion graphs. The ideas were arrived at by studying
examples of uniform motion or objects moving in straight line at constant speed.
Then you were introduced to non-uniform motion where the object covers unequal
displacements at equal intervals of time.
Figure 4. A moving car Figure 5. A car slowing down
When a car starts moving, it speeds up. When a car nears a stop sign, it
slows down. The car is covering different displacements at equal time intervals,
hence is not moving in constant velocity. This means the car is accelerating.
Notes to the Teacher
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