Assertion (A): Force exerted by the ground on the man moves him forward,
Reason (R) : It is a reactional force,
Answers
Answer:
both the assertion and reason are correct because the reactional force is exerted by the ground on the man which help him to move forward.
Answer:
The correct answer is (B) Both assertion and reason are correct but reason is not the correct explanation of assertion
Assertion (A): Force exerted by the ground on the man moves him forward
As the man walks on the ground, he exerts a force on the ground in backward direction.
Now, as per Newton's third law of motion, every force has equal and opposite reaction. The ground exerts a force of equal magnitude in the forward direction and the person moves forward.
Thus, force exerted by the ground on the man moves him forward is a correct statement.
Reason (R) : It is a reactional force.
As discussed above, the force is exerted on the ground when a man walks forward. As its reaction, frictional force acts on the foot.
However, the force on foot being reactional force is not the reason why the man moves ahead. He walks ahead because of frictional force of ground pushing on his foot forward.
Thus, assertion and reason are correct statements but reason statement does not explain assertion statement.