8. A book sits on a table. Earth pulls the book downward with a force of strengt

Question

8. 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. Find the overall force acting on the book. 9. 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. Find the size and direction of the overall force acting on the ball at this instant. 10. 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. Find the size of the overall force acting on the puck.

Explanation / Answer

8. net force = total downward force - total upward force

4 -4 = 0 N .....Ans

9.   net force = total downward force - total upward force

= (2 + 28 ) - 0 = 30 N downwards

10. net force = total downward force - total upward force

1 -1 = 0 N

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