2003 Question 6
(i) Give the difference between vector quantities and scalar quantities and give one
example of each.
(ii) Describe an experiment to find the resultant of two vectors.
(iii)A cyclist travels from A to B along the arc of a circle of radius 25 m as shown.
(iv) Calculate (i) the distance travelled by the cyclist.
(v) Calculate the displacement undergone by the cyclist.
(vi) A person in a wheelchair is moving up a ramp at a constant speed. Their total weight is 900
N.
The ramp makes an angle of 10o with the horizontal.
Calculate the force required to keep the wheelchair moving at a
constant speed up the ramp. (You may ignore the effects of friction.)
(vii) The ramp is 5 m long. Calculate the power exerted by the person
in the wheelchair if it takes her 10 s to travel up the ramp.
2003 Question 12 (a)
(i) State Newton’s second law of motion.
(ii) A skydiver falls from an aircraft that is flying horizontally.
He reaches a constant speed of 50 m s–1 after falling through a height of 1500 m.
Calculate the average vertical acceleration of the skydiver.
(iii)If the mass of the skydiver is 90 kg, what is the magnitude and direction of the average
resultant force acting on him?
(iv) Use a diagram to show the forces acting on the skydiver and explain why he reaches a
constant speed.
