A Block, Moving on a Frictionless Horizontal Surface on Earth

Multiple Choice

A block, moving on a frictionless horizontal surface on Earth, requires a force if it is to be stopped. Now suppose that the same block, moving with the same speed on a frictionless horizontal surface on the Moon, where gravity is less, is to be stopped in the same time. We can say that, compared to the Earth,

A) less force is required to stop the block on the Moon.
B) the force required would be the same.
C) greater force is required to stop the block on the Moon.
D) the block could not be stopped.