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Fig. 1. An example of a qualitative task describing a situation—a man pulls a dog but the dog does not move. The students are asked to explain the situation by using basic concepts and ideas of physics. First citation in article

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Fig. 2. Situations with interacting objects. First citation in article

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Fig. 3a. A block diagram (step 1.a). First citation in article

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Fig. 3b. Table of interactions (1.b). First citation in article

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Fig. 4a. Marking forces in the block diagram (2.a). First citation in article

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Fig. 4b. Isolating a selected object (2.b). First citation in article

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Fig. 5. A complete force diagram. First citation in article

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Fig. 6. “A Rocket Balloon”—a balloon on a fishing line. A small balloon that is filled with air is hooked to a fishing line and is allowed to move along the line when the air is released. The student needs to explain why the balloon is moving if it is fully filled with air but does not move when only partly filled. First citation in article

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Fig. 7. The Israeli matriculation question. The student's claim is incorrect because the box is involved with two interactions: one is with the Earth and the other is with the rope. First citation in article