Response:
1: C
2: C
3: A
4: Rolling Friction or Static Friction (Refer to explanation)
Clarification:
Whether it’s rolling or static friction depends on the surface condition; a smooth floor might lead to rolling friction being the valid choice, while a rough surface would indicate static friction.
Answer: This approach enables researchers to track the child's development.
Explanation:
The growth of children varies from one to another. It can be assessed as early as a few months after birth. Typically, infants start crawling around the sixth to seventh month of life, an essential milestone for development. A delay in crawling past seven months is not necessarily alarming but if a child hasn’t started crawling by their first birthday, it is advisable for parents to seek professional guidance.
