#3, they both come after infared and are not harmful to living cells.
Some examples of when friction is helpful are: to help the movement of tires. When you walk, and also, when you erase. :)
Rolling friction .<span> the force that slows down the movement of a rolling object</span>
sliding friction.
Sliding friction : The opposing force that comes into play when
one body is actually sliding over the surface of the other body
is called sliding friction. e.g. A flat block is moving over a
horizontal table.
Kinetic or dynamic friction: If the applied force is increased further
and sets the body in motion, the friction opposing the motion is called
kinetic friction
Answer:
a = F / m
Explanation:
force same -> mass variable
more mass -> less force
