how can you push your 2 - year - old baby brother (mass of 20kg) and your dad (mass of 100kg) in a swing so…
how can you push your 2 - year - old baby brother (mass of 20kg) and your dad (mass of 100kg) in a swing so that they have the same acceleration?\npush dad with less force\npush baby brother with less force\npush both of them with the same force\npush baby brother with more force
Answer
Explanation:
Step1: Recall Newton's second law
$F = ma$, where $F$ is force, $m$ is mass and $a$ is acceleration.
Step2: Analyze the situation for different masses
If $a$ is to be the same for two different masses $m_1$ and $m_2$ ($m_1<m_2$), from $F = ma$, the force on the smaller - mass object ($m_1$) should be smaller than the force on the larger - mass object ($m_2$). Since the baby brother has a mass of $20kg$ and the dad has a mass of $100kg$, to get the same acceleration, we should push the baby brother with less force.
Answer:
Push baby brother with less force