Ruff Ruffman loves to explore the world through science and engineering. You and your child can…

Ruff Ruffman loves to explore the world through science and engineering. You and your child can explore the concept of friction by conducting an investigation using a toy car and ramp. See what you need to get racing: http://bit.ly/2DQrmFw

Let us know what else you incorporated into your ramps by commenting below.