Based on the visual analysis of all four panels, I can now determine which ball moves faster.
-
Top-left panel: A larger boy is pushing a large red ball with considerable effort.
-
Top-right panel: A smaller boy is pushing an identical large red ball. He appears to be exerting less force than the boy in the top-left panel.
-
Bottom-left panel: A car is pulling a basketball. A car's engine generates vastly more force than any human.
-
Bottom-right panel: A small boy is pulling a basketball. While he is running, his force output is still limited by his human strength.
Conclusion for Part 1:
The basketball being pulled by the car (bottom-left panel) will move the fastest because the car can apply the greatest amount of force. Therefore, you should circle the basketball in the bottom-left panel.
---
Part 2: Is it easier to push a small ball or a big ball? Why?
This question requires applying Newton's Second Law of Motion, which states that Force equals Mass times Acceleration ($F = m \cdot a$).
-
Mass: A "big ball" has more mass than a "small ball." This means it contains more matter and is heavier.
-
Force Required: To accelerate an object (i.e., to make it start moving or change its speed), you must apply a force. The greater the mass of the object, the more force is required to achieve the same acceleration.
-
Ease of Pushing: "Easier to push" means requiring less force from the person. Since the small ball has less mass, it requires less force to accelerate it compared to the big ball.
Conclusion for Part 2:
It is easier to push a small ball because it has less mass. According to Newton's Second Law, an object with less mass requires less force to accelerate than an object with more mass. Therefore, a person can get a small ball moving with less effort than a big ball.
---
Final Answer
To solve the problem presented in the image:
1.
Circle the ball that moves faster: You should circle the
basketball being pulled by the car in the bottom-left panel. This is because the car can generate a much greater force than any of the children shown, resulting in the highest acceleration and thus the fastest movement.
2.
Is it easier to push a small ball or a big ball? Why?
It is easier to push a
small ball. The reason is based on physics: a small ball has less mass than a big ball. According to Newton's Second Law of Motion ($F = m \cdot a$), an object with less mass requires less force to accelerate. Therefore, a person needs to exert less force to get a small ball moving, making it easier to push.
Parent Tip: Review the logic above to help your child master the concept of science forces and motion worksheet.
