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T1 CH2 Force and Motion — Science STD 7 — Question

Tamilnadu BoardEnglish MediumSTD 7ScienceT1 CH2 Force and Motion2 Marks
Question
Define the following:
  1. positive acceleration
  2. negative acceleration.
✓

Answer

(i) Positive acceleration:
If the velocity of an object increases with respect to time, then the object is said to be in positive acceleration or just acceleration.
(ii) Negative acceleration or deceleration or retardation:
If the velocity of an object decreases with respect to time, then the object is said to be in negative acceleration or deceleration or retardation.

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