On the Playground: Motion - Kids Academy worksheet teaching motion and position through playful activities.

To solve this problem, we need to understand what "straight motion" means. Straight motion is when something moves in a straight line, like an arrow pointing directly from one place to another without curving or going in circles.

Let's look at each picture on the worksheet:

1. Boy on the merry-go-round: The dotted line shows a circle. This is curved motion, not straight.
2. Girl on the swing: The dotted line shows an arc (a curve up and down). This is not straight.
3. Girl running: There is no dotted line showing her path, but she is running forward. However, let's look for the clear dotted lines first. Wait, looking closely at the girl running towards the boy, there is a dotted line connecting them. It is a straight dashed line. So, this represents straight motion.
4. Boy sliding down the spiral slide: The dotted line follows the curve of the slide. This is curved motion.
5. Boy pushing the car: The dotted line behind the car is a straight horizontal arrow. This shows the car moving in a straight line. This is straight motion.

So, the pictures that show straight motion are:
- The girl running towards the boy (connected by a straight dotted line).
- The boy pushing the toy car (with a straight dotted arrow).

Wait, let me re-examine the image carefully.

- Merry-go-round: Circular path. Not straight.
- Swing: Arc path. Not straight.
- Spiral Slide: Curved/spiral path. Not straight.
- Girl running to boy: There is a dotted line between them. It is straight. So this is straight motion.
- Boy with car: There is a dotted arrow pointing to the right. It is straight. So this is straight motion.

Therefore, we should check the boxes next to:
1. The girl running towards the boy.
2. The boy pushing the yellow car.

Final Answer: Check the box next to the girl running towards the boy and the box next to the boy pushing the yellow car.