Guidelines handout. (a) A worker pushes a 25.0 kg lawnmower with a force of 37.5 N directed along the handle. The handle is at an angle of 30.0° above the horizontal. The coefficient of kinetic friction between the lawn mower and the ground is 0.115. Assuming no air resistance, determine the normal force and acceleration of the lawnmower. (b) Start on a new sheet of paper. You do not need a new a 25.0 kg lawnmower with a force of 37.5 N directed along the handle. The handle is at an horizontal. Assuming |(c) Compare the magnitudes of the accelerations for the two cases. They are not equal. (d) Compare the normal forces for the two cases. They are not equal! Simplify and only one Evaluation is necessary. A worker pulls angle of 30.0° above the no friction or air resistance, determine the normal force and acceleration of the lawnmower. Fw on L 37.5 N Fw on L 37.5N 1 0 30.0° 0- 30.0 O-O

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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?”