1. A student whirls a 0.75kg mass around on the end of a string in a horizontal circle. The radius of the circle is 81cm and the speed of the mass is 7.1ms -1 a)Calculate the centripetal force acting on the mass b)On the diagram, sketch the forces acting on the mass c)Sketch a vector triangle showing how the centripetal force is the vector sum of the forces acting on the mass Do now: Wenerei, 9 Mahuru 2015

2. Our Kaupapa: LO5: Analyse the forces involved in circular motion - conical pendulum - banked curves - vertical circular motion Homework Reminder: NZQA Circular Motion Questions 1-4 Due: Wed 26 th Feb

3. Board Notes

4. A conical pendulum is made from a mass of 0.20kg which moves in a circle of radius 0.40m at a constant speed. The string makes an angle of 30 o with the vertical. Calculate the speed of the mass. (Assume g = 9.8ms -2 ) Example: Conical pendulum

5. A cyclist (and cycle) of mass 80kg move around a bend of radius 20m. The tyres can handle a maximum friction force of 250N. Calculate the maximum speed the cyclist can travel around the bend if: (assume g = 9.8ms -2 ) a) the bend is unbanked b) the bend is banked at 25 o Example: Banked curves