a) Circular motion

dii) techniques and procedures used to investigate circular motion using a whirling bung

dependent variable → period

independent variable → radius

control variable → mass/angular velocity

investigating centripetal force

• swing the bung in a horizontal circle

• ensure the radius remains constant

• measure the time taken for one revolution

• repeat for different radii

• calculate speed

analysis

• plot a graph of speed² (m²s^-2) against radius (m)

• v² = (F/m)r

• calculate the gradient → calculate F