Intro to Forces + Newton's Laws Video Lessons

Concept

# Problem: In outer space, where there is no gravity or air, an astronaut pushes with an equal force of 15 N on a 3-kg moon rock and on a 6-kg moon rock.A) Since both rocks are weightless, they will have the same acceleration.B) Since both rocks are weightless, they do not push back on the astronaut.C) The 6 kg rock pushes back on the astronaut twice as hard as the 3-kg rock.D) Both rocks will push back at the astronaut with 15 N.E) Since the astronaut is weightless, he cannot push on the rocks.

###### Problem Details

In outer space, where there is no gravity or air, an astronaut pushes with an equal force of 15 N on a 3-kg moon rock and on a 6-kg moon rock.

A) Since both rocks are weightless, they will have the same acceleration.

B) Since both rocks are weightless, they do not push back on the astronaut.

C) The 6 kg rock pushes back on the astronaut twice as hard as the 3-kg rock.

D) Both rocks will push back at the astronaut with 15 N.

E) Since the astronaut is weightless, he cannot push on the rocks.