Learn the difference between distance, displacement, speed and velocity, and how to calculate distance, speed and acceleration.

The film demonstrates how to make valid measurements and how to use them to calculate acceleration and study the effects of changing force or mass.

In this case, the acceleration is zero m/s 2 (as seen in the graph showing the acceleration) and the tension in the string is just the weight of mass 2 (0.145 kg)* (9.8 N/kg) = 1.421 N.