We need to charge a metal sphere positively without touching it. This can be achieved using electrostatic induction.
Force-a push or pull exerted on an object.
Answer:

Explanation:
Given data:
Momentum of moving model train, 
Mass of the stationary model train, 
Initial speed of the stationary model train, 
Assume there is no external force is acting on the given train system.
In this case, the total linear momentum of the trains would be conserved.
Let the final linear momentum of the trains be 
Thus,





I would say that an astronaut will fell the lightest in the moon because all of the low gravity.
Very appreciated if this answer helped you out .
When glass is rubbed with a dry cloth, the friction creates charged static electricity; this in turn attracts small non charged particles of dust. The simplest way to put it, the dry cloth creates a static charge that attracts non charged dust particles.