Friction is a force that opposes motion. It is present whenever two surfaces rub over each other, such as when you rub your hands together, or when you apply the brakes on a bike or in a car.

According to Newton's third law of motion, whenever two objects interact, they exert equal and opposite forces on each other. This is often worded as 'every action has an equal and opposite reaction'.

Newton’s Laws will help your students understand force, motion, and the transfer of energy. In this classroom presentation, engaging hands-on activities help demonstrate these important concepts your ...