A book sits on a table. Earth pulls the book downward with a force of strength 4 N. The table pushes the book upward with a force of strength 4 N. Discover the overall force acting on the book.
1. A football player spikes a football after scoring a touchdown. Earth exerts a downward force of strength 2 N on the ball, while the player exerts a downward force of strength 28 N on the ball. Discover the size and direction of the overall force acting on the ball at this instant.
2. While an air-hockey puck glides across the table, Earth exerts a downward force of strength 1 N on the puck, while air rushing out of holes in the table exerts an upward force of strength 1 N on the puck. Discover the size of the overall force acting on the puck.