Sir Isaac Newton was the first person to study gravity. He was sitting under an apple tree. An apple fell from the tree and hit him on the head. He discovered that gravity made things fall to Earth.
Photo Credit: McGraw Hill
In the Know
What Makes Race Cars So Fast?
Forces [pushes and pulls] make cars move. A car’s engine … read more
In the Know
Fireworks
The firework goes higher and higher. Chemicals in the firework … read more
In the Know
Winter Wonders
Winter has begun. Many places find ways to make the … read more