Achild pulls a wagon at a constant velocity along a level sidewalk. the child does this by applying a 22 newton force to the wagon handle, which is inclined at 35° to the sidewalk as shown below. what is the magnitude of the fore of friction on the wagon?

The answer is 18 N.

Explanation:

A force can be divided into components x and y components. The component along the x-axis is called the horizontal component and along the y-axis is called the vertical component. In this case, as the force is in a horizontal direction and is also known as x-component of force. The x- component of force is  

Fx = Fcosθ

Fx = 22(cos 35°)

Fx = 22 x 0.819

Fx =  18 N

Child's horizontal pull forces are equal to that of frictional resistance force on the wagon.

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