Force and Laws of Motion — Science STD 9 — Question

A moving bicycle comes to rest after sometime if we stop pedalling it. But Newton’s first law of motion says that a moving body should continue to move for ever, unless some external force acts on it. How do you explain the bicycle case?

How do substances like carbon dioxide (CO₂) and water (H₂O) move in and out of the cell?

brief state what happens when:
Golgi apparatus is removed from the cell?

Describe the term ‘inertia’ with respect to motion.

Enumerate various cells of connective tissue.

A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.

Find the acceleration produced by a force of 5N acting on a mass of 10kg.