Friction is a word to describe a force that slows objects down. It occurs when two objects rub against each other and affects the speed of a moving object. Different materials create different amounts of friction, or resistance. If a marble rolls across a rug, it would move more slowly than across a wood floor.
What’s Needed:
- Marble Rush™ Ultimate Set
- 10 Marbles
- A watch, stopwatch or stopwatch app
- Masking tape or painter’s tape
- Kitchen aluminum foil and plastic wrap