Educational worksheet for children on forces and interactions, including questions on motion, push/pull forces, balanced/unbalanced forces, and identifying magnetic objects.

I can see the four objects for question 4 clearly now: a paperclip, a pen, a ball of yarn, and a key.

Let me analyze each one to determine which are magnetic:

1. Paperclip: This is typically made of steel (an iron alloy), which is ferromagnetic. Paperclips are famously used in magnetism experiments because they are attracted to magnets.

2. Pen: Most pens have plastic bodies with some metal components (like the clip or tip). However, these metal parts are often made of non-magnetic materials like aluminum or brass. The pen shown appears to have a black body with a silver-colored clip, but without knowing the exact material, it's safer to assume it's not primarily magnetic.

3. Yarn: This is made of wool or synthetic fibers, which are not magnetic materials.

4. Key: Keys are often made of brass (copper-zinc alloy) or other non-ferrous metals that are not magnetic. While some keys might be made of steel, the golden color suggests this is likely brass, which is not magnetic.

Based on this analysis, only the paperclip is definitively magnetic among these options.

Now I'll provide the complete solution to all questions.

Solution:

1. When something changes position it is in: motion
- Explanation: Motion is defined as the change in position of an object over time.

2. This is an example of: pull
- Explanation: The boy is holding the leash while the dog is pulling forward, demonstrating a pulling force.

3. In this picture, the force is: unbalanced
- Explanation: Since the door moves when the girl pushes it, there is a net force acting on the door, meaning the forces are unbalanced.

4. Circle the objects that are magnetic: Only the paperclip
- Explanation: Paperclips are typically made of steel (iron), which is magnetic. The pen, yarn, and key are generally not made of magnetic materials.