An object of mass 1,8 kg slides down a rough curved track and passes point A, which is 1,5 m above the ground, at a speed of 0,95 m·s-1.
The object reaches point B at the bottom of the track at a speed of 4 m·s-1.
5.1 Define the term conservative force. (2)
5.2 Name the conservative force acting on the object. (1)
5.3 Is mechanical energy conserved as the object slides from point A to point B? Choose from YES or NO.
Give a reason for the answer. (2)
5.4 Calculate the gravitational potential energy of the object when it was at point A. (3)
5.5 Using energy principles, calculate the work done by friction on the object as it slides from point A to point B. (4)
Surface BC in the diagram above is frictionless.
5.6 What is the value of the net work done on the object as it slides from point B to point C? (1)
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