The free body diagram for the 5 kg radio on a bookshelf includes the force of gravity acting downward
and the upward normal force (N) from the bookshelf, indicating equilibrium.
The free body diagram for the 5 kg radio on a bookshelf would include the force of gravity acting downward (weight), which is given by
, where m is the mass (5 kg) and g is the acceleration due to gravity (approximately 9.8 m/s²).
There is also the normal force acting upward from the bookshelf, denoted as N, counteracting the force of gravity. Assuming the radio is at rest on the bookshelf, there is no net force, and these two forces are balanced.