1. a 10.00 kg object is sliding across a surface. The kinetic frictional force is 1.96 N. It took an applied force of 16.96 N to cause the box to accelerate at 1.50 m/s2.  a.) what is the KINETIC COEFFICIENT of friction between the two surfaces? b.) determine what the two surfaces are made of (using Table below) KINETIC FRICTION: 0.20 steel on steel , 0.13  steel on steel lubricated .40 glass on glass, 0.25 hardwood on hardwood .30 steel on concrete, 1.0 rubber on dry concrete 0.97 rubber on wet concrete, 0.02 aluminum on wet snow 0.04 steel on teflon  use Newton's full second law of equation: Fa + Ff = m a

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”