1. A barge is pulled along a canal with the aid of a horse on each bank.
(a) Find the size and direction of the resultant force acting on the barge. (3)
(b) If the mass of the barge is 1700 kg and there is a constant frictional
force of 281 N acting, then calculate the acceleration of the barge. (3)
(c) If the horse on the south bank now pulls with the same size of force but
at an angle of only 100, then the barge will go off course.
Using scale diagram or otherwise.
Calculate the size of force and direction that the barge will now take. (5)
2. An object of mass 5 kg is moving down a slope inclined at 200 to the
horizontal with a constant speed of 3 ms-1.
(a) Calculate the component of weight acting down the slope. (3)
(b) State the force of friction acting up the slope.
Justify your answer. (2)
ODU 6 – Forces at an Angle
5 kg
200
3 ms-1
BARGE
450
450
NORTH BANK
SOUTH BANK
800 N
800 N
HORSE
HORSE
