a girl hitting a ball with a bat a boy pushing a box across the floor a girl hammering a nail into a wall a boy falling from a tree onto the ground
I gave my students this multiple choice question: In which example does an object move because of the force of gravity?

Only one answer is correct among these 4 choices:
- a girl hitting a ball with a bat
- a boy pushing a box across the floor
- a girl hammering a nail into a wall
- a boy falling from a tree onto the ground

Could you tell me which one is correct?

a boy falling from a tree onto the ground