Some will be inside the computer and others will be outside. Some parts are attached by wires and others are wireless.

The parts that make up a computer are called ‘hardware’. Programs which tell a computer what to do are called ‘software’. The hardware needs the software to tell it what to do.

Friction slows an object down. If you roll a ball on the floor, friction between the floor and the ball will slow its movement.
If you slide a block however, it will be even slower than the ball. Objects tend to roll more easily than slide, because rolling creates less friction.

That's why Roller Skating is a game we play with Gravity and Friction. 

Source- Wonderopolis.org

The outer space, however, has no air, no atmosphere and hence the Sun’s light doesn’t bounce off any colours and so outer space appears all black to us.



Thank you planetsforkids.org

Each planet has different moons and these moons revolve around the planet in their respective orbits. Moons do not have any light of their own and they reflect the light of the Sun that they receive.



Thank you - Mamma, My Big Book of Stars & Planets by Usborne