science
Grade-7
Easy
Question
Pick the odd one out.
- An accelerating car
- A decelerating runner
- Free -fall
- A uniformly moving car
Hint:
F=0 for option d. And for other options F is not equal to zero.
The correct answer is: A uniformly moving car
- F= ma.
- An accelerating car has horizontal forward force.
- Decelerating runner has also net force in opposite direction.
- Free fall is any motion of a body where gravity is the only force acting upon it.
- But for uniformly moving car, velocity remains constant as it covers equal distances in equal intervals of time.
- Means the acceleration of the body will be zero. Hence, F=0.
- So, the correct option is d.
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