How Objects Move Homework

AC9SFU02 — Answer guide

SkillrHub · Adult copy. Read directions aloud if needed; accept spoken explanations grounded in the examples.

1. rolls. A marble turns over and over as it moves along a surface.

   Teaching hint: Describe the kind of movement.

2. a flat block, resting on a flat face.

   Teaching hint: Its flat face can slide along the surface rather than roll.

3. roll → marble moving; slide → book moving flat; bounce → ball moving up after hitting the floor.

   Teaching hint: Look for turning over, sliding along or rising again after contact.

4. same. Use the same surface and starting point.

   Teaching hint: A similar start makes the observations easier to compare.

5. For example, roll and bounce. Slide and spin are also acceptable.

   Teaching hint: Name movements rather than only fast or slow.

6. A marble has a curved surface that allows rolling; a block on a flat face tends to slide or stay still.

   Teaching hint: Report what happens on the actual slope; a block can also tumble.

7. material. What an object is made from can influence its movement.

   Teaching hint: Think about similar-shaped balls made from different materials.

8. shape → round or flat; size → large or small; material → rubber or foam.

   Teaching hint: Name the difference being compared.

9. No. The smaller ball went farther in this trial. Size alone cannot explain it because the balls also differ in material.

   Teaching hint: Describe the observed result and notice the other difference.

10. With adult guidance, release both from the same low height onto the same surface without pushing. Observe and repeat their bouncing.

    Teaching hint: Keep starting conditions alike and compare what actually happens.