One of activities we did was a marble race. The kids had a relay race where they had to push a marble down a track using nothing but a straw and the air they PUSHED through it. Here is a video:
We also learned about the PULL force of gravity and the PUSH force of friction. To explore these concepts, we built ramps to try and move certain objects down: a rubber eraser, a toy car, a smooth rock, and a cube block. We discovered that the rubber eraser needed a higher incline which meant there was a greater force of friction acting upon it. Meanwhile, the car needed less of an incline to move because there was less friction acting upon the wheels. We also learned that gravity is the force that pulls these objects down the ramp and it's the same force keeping us on the ground.
To understand gravity a little better, Ms. King found a great video of an astronaut in space. The kids were amazed at her floating because of zero gravity.
Ask your kids about what they've been learning about in science.
Standards this unit is addressing: