Question

Which object has a net force of –68 N?

A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline = negative 74 N. The second vector is pointing right, labeled F Subscript p Baseline = 53 N. The third vector is pointing upward, labeled F Subscript N Baseline = 31 N. The fourth vector is pointing left, labeled F Subscript f Baseline = negative 53 N. The upward vector is smaller in length than the downward. The right vector is the same length as the left vector.

A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline = negative 89 N. The second vector is pointing right, labeled F Subscript p Baseline = 103 N. The third vector is pointing upward, labeled F Subscript N Baseline = 89 N. The fourth vector is pointing left, labeled F Subscript f Baseline = negative 56 N. The upward vector is the same length as the downward vector. The right vector is longer than the left vector.

A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline = negative 27 N. The second vector is pointing right, labeled F Subscript p Baseline = 34 N. The third vector is pointing upward, labeled F Subscript N Baseline = 27 N. The fourth vector is pointing left, labeled F Subscript f Baseline = negative 102 N. The upward vector is the same length as the downward vector. The right vector is shorter than the left vector.

Answer 1

The third diagram. Horizontal: 34 N (right) + (−102 N) (left) = −68 N. Vertical: −27 N + 27 N = 0. So the net force is −68 N (68 N to the left).