Newton's Laws and friction.

Newton's First Law, Second Law, Friction Trolleys are located behind the wall near Electrical Area. Updated on: 06/13/13

• To show equal forces.

• To show that the center of mass of the system remains at rest.

2 trolleys, 2 chairs, 1 rope, 1 heavy student, 1 light student.

Make sure that the wheels of both trolleys are aligned before the demonstration and both students should start with a slight jerk to overcome friction.