Questions with the keyword 'mass'

• If a new baby was born would it make the world heavier? by to Andrei, Ekbal, Gemma, Helen, Ruth Comments: (No comments so far )
• Why does gravity pull you down? by to Andrei, Ekbal, Gemma, Helen, Ruth Comments: (No comments so far )
• why do people say that pluto is not a planet? by to Andrei, Ekbal, Gemma, Helen, Ruth Comments: (No comments so far )
• what would happen if everyone in the world jumped at the same time by and 1 other. to Ekbal, Andrei, Gemma, Helen, Ruth Comments: (No comments so far )