A box, with a mass of 45 kg, is pulled with a force of 90 N at an angle of 50ยบ to the
horizontal. The box moves at a CONSTANT VELOCITY.
3.1 Define the term kinetic frictional force. (2)
3.2 State Newton’s First Law of Motion in words. (2)
3.3 Calculate the magnitude of the horizontal component of the applied force. (2)
3.4 Calculate the magnitude of the normal force. (4)
3.5 Calculate the coefficient of kinetic friction. (4)
3.6 Will the coefficient of kinetic friction change if the angle of the applied force is
decreased? Write only YES or NO and give a reason. (2)
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