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# Calculate the normal reaction force?

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1. A boat of mass 800kg is pulled along the sand at constant velocity by a cable attached to a winch.the cable is at an angle of 15° to the horizontal.

IF the tension in the cable is 4kN show that:
The normal reaction of the sand on the boat is about 7kN
2. Split the 4KN tension into vertical and horizontal components. (Using trigonometry).

Find the RESULTANT force on the sand, remembering force is a vector, i.e. a force in an opposite direction is taken as negative.

Due to Newton's third law, the resultant force of the boat on the sand is the same as the reaction force of the sand on the boat.

GL

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Updated: December 6, 2010
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