Question

A train pulls the boxcars. What are the vertical forces present? (1 point)
O weight, friction
O weight, pull of air on boxcars
O weight, push of tracks against wheels
O pull of air on boxcars, push of tracks against wheels

Answer 1

The vertical forces present in a boxcars being pulled by a train are weight and pull of air on the boxcars.

The forces exerted on an object can be resolved into horizontal and vertical components.

The horizontal components of the forces on an object being pulled include the following;

• The frictional force on the object; which tends to reduce the motion,

• force dragging the object forward

• if the object is inclined to an angle, the horizontal component of the weight

This horizontal force is written as;

$\Sigma F_x = 0\\\\F_x - F_k = ma$

The vertical component of the force on the object include the following;

• the weight of the object acting downwards

• the pull of air on the object acting upwards

The vertical force on the object is written as;

$\Sigma F_n = 0\\\\F_n - W = 0$

Thus, the vertical forces present in a boxcars being pulled by a train are weight and pull of air on the boxcars.

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