9th Class
Science
Force and laws of motion
Question Bank
9th CBSE Science Force and laws of motion
question_answer
(i)
Explain why is it difficult to walk on sand?
(ii) Why is the recoil of a heavy gun, on firing, not so strong as that
of a light gun using the same cartridge?
(iii) A constant force acts on an object of 5 kg for a
period of 2 s. It increases the velocity of an object from 3 m/s to 7 m/s.
Find the magnitude of the applied force. Now if the force
was applied for a period of 5 s, what would be the final velocity of the
object?