I had a problem like this once and it ended up being the idler air valve.
the motion that makes things slow down is friction
It is the friction between the snowboard and the snow that makes it slow down.
They get colder, and start to lose heat.
They slow down gradually and lose height as they land
Not necessarily but if you use them often, they will lose their effectiveness.
Cooling system is leaking and the engine is getting hot. Hot engines burn the fuel before it can ignite and you lose power.
Gravity
GravIty
force
alcohol makes you very clumsy and slow and is a depressant, unlike ecstacy, it will slow down your heart rate.
it is the oil that makes it slow down
Nothing happens to the forces. The forces are what makes the thing speed up or slow down.