This is bad, but when you think about it, the answer is not as obvious as it initially seems. I believe the earth's gravity is stronger than the moon's even on

This is bad, but when you think about it, the answer is not as obvious as it initially seems. I believe the earth's gravity is stronger than the moon's even on the surface of the moon. In order to get the correct answer a student must think about orbital velocities and the way velocity helps objects stay in orbit and not fall to the ground, even if there is a gravity force exerted on them. And then the student would have to imagine the pen not as something stationary on the moon, but as something that is travelling around the earth (with the moon) at high velocity, and then the student would have to realise that the pen has sufficient orbital velocity not to fall to the earth, but in relation to the moon it has very little orbital velocity, so it will fall to the moon and not to the earth. So my point is this is not that simple and it requires some imagination and complicated reasoning to get the right answer. Of course most people should get it by remembering the moon landing videos and remembering how the astronauts were bound by the moon's gravity in those videos, but maybe kids these days have not even seen the moon landing videos.