3. A music box within the toy shown below plays tunes when the toy is pushed
along the floor. As a child pushes along the handlebars with a force of 5 N, the
floor exerts a force of 13 N directly upward on the toy. The Earth's
gravitational force on the toy is 10 N downward while interactions between the
wheels and the floor produce a backward force of 2 N on the toy as it moves.
Draw a free-body diagram of the toy as it is being pushed.